Convert CONFIG_SYS_MEMTEST_START et al to Kconfig

This converts the following to Kconfig:
   CONFIG_SYS_MEMTEST_START
   CONFIG_SYS_MEMTEST_END

This is removing unused defines and correcting the default value to be
0x0 as we are a hex symbol.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/cmd/Kconfig b/cmd/Kconfig
index fd8f022..7747ab5 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -741,7 +741,7 @@
 
 config SYS_MEMTEST_START
 	hex "default start address for mtest"
-	default 0
+	default 0x0
 	help
 	  This is the default start address for mtest for simple read/write
 	  test. If no arguments are given to mtest, default address is used
diff --git a/include/configs/imx8mm_beacon.h b/include/configs/imx8mm_beacon.h
index 1040a68..77f0624 100644
--- a/include/configs/imx8mm_beacon.h
+++ b/include/configs/imx8mm_beacon.h
@@ -91,9 +91,6 @@
 #define PHYS_SDRAM			0x40000000
 #define PHYS_SDRAM_SIZE		0x80000000 /* 2GB DDR */
 
-#define CONFIG_SYS_MEMTEST_START	PHYS_SDRAM
-#define CONFIG_SYS_MEMTEST_END	(CONFIG_SYS_MEMTEST_START + (PHYS_SDRAM_SIZE >> 1))
-
 #define CONFIG_MXC_UART_BASE		UART2_BASE_ADDR
 
 /* Monitor Command Prompt */
diff --git a/include/configs/imx8mm_icore_mx8mm.h b/include/configs/imx8mm_icore_mx8mm.h
index fe997f9..d75fcf7 100644
--- a/include/configs/imx8mm_icore_mx8mm.h
+++ b/include/configs/imx8mm_icore_mx8mm.h
@@ -28,9 +28,6 @@
 # define CONFIG_SPL_ABORT_ON_RAW_IMAGE
 #endif /* CONFIG_SPL_BUILD */
 
-#define CONFIG_SYS_MEMTEST_START	PHYS_SDRAM
-#define CONFIG_SYS_MEMTEST_END	(CONFIG_SYS_MEMTEST_START + (PHYS_SDRAM_SIZE >> 1))
-
 #ifndef CONFIG_SPL_BUILD
 #define BOOT_TARGET_DEVICES(func) \
 	func(MMC, mmc, 2) \
@@ -69,10 +66,6 @@
 #define PHYS_SDRAM_SIZE			SZ_2G /* 2GB DDR */
 #define CONFIG_SYS_BOOTM_LEN		SZ_256M
 
-#define CONFIG_SYS_MEMTEST_START	PHYS_SDRAM
-#define CONFIG_SYS_MEMTEST_END	\
-	(CONFIG_SYS_MEMTEST_START + (PHYS_SDRAM_SIZE >> 1))
-
 /* UART */
 #define CONFIG_MXC_UART_BASE		UART2_BASE_ADDR
 
diff --git a/include/configs/imx8mq_phanbell.h b/include/configs/imx8mq_phanbell.h
index 7afdfd6..1668ca8 100644
--- a/include/configs/imx8mq_phanbell.h
+++ b/include/configs/imx8mq_phanbell.h
@@ -116,10 +116,6 @@
 #define PHYS_SDRAM                      0x40000000
 #define PHYS_SDRAM_SIZE			0x40000000 /* 1GB DDR */
 
-#define CONFIG_SYS_MEMTEST_START	PHYS_SDRAM
-#define CONFIG_SYS_MEMTEST_END		(CONFIG_SYS_MEMTEST_START + \
-					(PHYS_SDRAM_SIZE >> 1))
-
 #define CONFIG_MXC_UART_BASE		UART1_BASE_ADDR
 
 /* Monitor Command Prompt */
diff --git a/include/configs/kontron_sl28.h b/include/configs/kontron_sl28.h
index 4152851..84dd818 100644
--- a/include/configs/kontron_sl28.h
+++ b/include/configs/kontron_sl28.h
@@ -30,10 +30,6 @@
 /* early stack pointer */
 #define CONFIG_SYS_INIT_SP_ADDR		(CONFIG_SYS_FSL_OCRAM_BASE + 0xeff0)
 
-/* memtest command */
-#define CONFIG_SYS_MEMTEST_START        0x80000000
-#define CONFIG_SYS_MEMTEST_END          0x9fffffff
-
 /* SMP */
 #define CPU_RELEASE_ADDR		secondary_boot_addr
 
diff --git a/include/configs/pico-imx8mq.h b/include/configs/pico-imx8mq.h
index 716f132..2293a29 100644
--- a/include/configs/pico-imx8mq.h
+++ b/include/configs/pico-imx8mq.h
@@ -95,10 +95,6 @@
 #define PHYS_SDRAM			0x40000000
 #define PHYS_SDRAM_SIZE			0x80000000	/* 2 GiB DDR */
 
-#define CONFIG_SYS_MEMTEST_START	PHYS_SDRAM
-#define CONFIG_SYS_MEMTEST_END		(CONFIG_SYS_MEMTEST_START + \
-					(PHYS_SDRAM_SIZE >> 1))
-
 #define CONFIG_MXC_UART_BASE		UART1_BASE_ADDR
 
 /* Monitor Command Prompt */
diff --git a/include/configs/synquacer.h b/include/configs/synquacer.h
index 3d099b4..2347ec2 100644
--- a/include/configs/synquacer.h
+++ b/include/configs/synquacer.h
@@ -41,9 +41,6 @@
 #define CONFIG_SYS_FLASH_BASE		(0x08000000)
 #define CONFIG_SYS_FLASH_BANKS_LIST	{CONFIG_SYS_FLASH_BASE}
 
-#define CONFIG_SYS_MEMTEST_START	(CONFIG_SYS_SDRAM_BASE + (512 * 1024))
-#define CONFIG_SYS_MEMTEST_END		(CONFIG_SYS_SDRAM_BASE + PHYS_SDRAM_SIZE)
-
 #define CONFIG_SYS_CBSIZE		1024
 #define CONFIG_SYS_MAXARGS		128
 #define CONFIG_SYS_PBSIZE		(CONFIG_SYS_CBSIZE + sizeof(CONFIG_SYS_PROMPT) + 16)