Convert CONFIG_SYS_NAND_SIZE to Kconfig

This converts the following to Kconfig:
   CONFIG_SYS_NAND_SIZE

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/mtd/nand/raw/Kconfig b/drivers/mtd/nand/raw/Kconfig
index 5483efe..eb37b62 100644
--- a/drivers/mtd/nand/raw/Kconfig
+++ b/drivers/mtd/nand/raw/Kconfig
@@ -461,6 +461,11 @@
 	  This enables the NAND driver for the NAND flash controller on the
 	  i.MX27 / i.MX31 / i.MX5 processors.
 
+config SYS_NAND_SIZE
+	int "Size of NAND in kilobytes"
+	depends on NAND_MXC && SPL_NAND_SUPPORT
+	default 268435456
+
 config NAND_MXS
 	bool "MXS NAND support"
 	depends on MX23 || MX28 || MX6 || MX7 || IMX8 || IMX8M
diff --git a/include/configs/M5329EVB.h b/include/configs/M5329EVB.h
index 47ea51c..a39fe5f 100644
--- a/include/configs/M5329EVB.h
+++ b/include/configs/M5329EVB.h
@@ -94,7 +94,6 @@
 
 #ifdef CONFIG_CMD_NAND
 #	define CONFIG_SYS_NAND_BASE		CONFIG_SYS_CS2_BASE
-#	define CONFIG_SYS_NAND_SIZE		1
 #	define CONFIG_SYS_NAND_BASE_LIST	{ CONFIG_SYS_NAND_BASE }
 #	define NAND_ALLOW_ERASE_ALL	1
 #endif
diff --git a/include/configs/M5373EVB.h b/include/configs/M5373EVB.h
index a2e36cc..f073471 100644
--- a/include/configs/M5373EVB.h
+++ b/include/configs/M5373EVB.h
@@ -95,7 +95,6 @@
 #endif
 
 #	define CONFIG_SYS_NAND_BASE		CONFIG_SYS_CS2_BASE
-#	define CONFIG_SYS_NAND_SIZE		1
 #	define CONFIG_SYS_NAND_BASE_LIST	{ CONFIG_SYS_NAND_BASE }
 #	define NAND_ALLOW_ERASE_ALL	1
 
diff --git a/include/configs/m53menlo.h b/include/configs/m53menlo.h
index a20b41b..3652241 100644
--- a/include/configs/m53menlo.h
+++ b/include/configs/m53menlo.h
@@ -86,12 +86,6 @@
 /* Watchdog */
 
 /*
- * NAND SPL
- */
-
-#define CONFIG_SYS_NAND_SIZE		(256 * 1024 * 1024)
-
-/*
  * Extra Environments
  */
 #define CONFIG_HOSTNAME		"m53menlo"
diff --git a/include/configs/smartweb.h b/include/configs/smartweb.h
index 538aad9..5460c12 100644
--- a/include/configs/smartweb.h
+++ b/include/configs/smartweb.h
@@ -96,7 +96,6 @@
 #define	CONFIG_SYS_NAND_U_BOOT_START	CONFIG_TEXT_BASE
 #define CONFIG_SYS_NAND_U_BOOT_DST	CONFIG_TEXT_BASE
 
-#define CONFIG_SYS_NAND_SIZE		(SZ_256M)
 #define CONFIG_SYS_NAND_ECCSIZE		256
 #define CONFIG_SYS_NAND_ECCBYTES	3
 #define CONFIG_SYS_NAND_ECCPOS		{ 40, 41, 42, 43, 44, 45, 46, 47, \
diff --git a/include/configs/taurus.h b/include/configs/taurus.h
index 5ab087d..f130c63 100644
--- a/include/configs/taurus.h
+++ b/include/configs/taurus.h
@@ -130,7 +130,6 @@
 #define	CONFIG_SYS_NAND_U_BOOT_START	CONFIG_TEXT_BASE
 #define CONFIG_SYS_NAND_U_BOOT_DST	CONFIG_TEXT_BASE
 
-#define CONFIG_SYS_NAND_SIZE		(256 * SZ_1M)
 #define CONFIG_SYS_NAND_ECCSIZE		256
 #define CONFIG_SYS_NAND_ECCBYTES	3
 #define CONFIG_SYS_NAND_ECCPOS		{ 40, 41, 42, 43, 44, 45, 46, 47, \