Remove CONFIG_SYS_MMC_IMG_LOAD_PART from CONFIG namespace

This option is used as part of configuring the default environment for a
number of platforms.  However, it is always set to 1 and the only time
it is part of Kconfig, it is used in a hard-coded manner.  Hard-code the
value in the environment instead.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/include/configs/pico-imx8mq.h b/include/configs/pico-imx8mq.h
index cd0116d..716f132 100644
--- a/include/configs/pico-imx8mq.h
+++ b/include/configs/pico-imx8mq.h
@@ -54,7 +54,7 @@
 	"initrd_addr=0x43800000\0"					\
 	"initrd_high=0xffffffffffffffff\0"				\
 	"mmcdev=" __stringify(CONFIG_SYS_MMC_ENV_DEV) "\0"		\
-	"mmcpart=" __stringify(CONFIG_SYS_MMC_IMG_LOAD_PART) "\0"	\
+	"mmcpart=1\0"	\
 	"mmcroot=" CONFIG_MMCROOT " rootwait rw\0"			\
 	"mmcautodetect=yes\0"						\
 	"mmcargs=setenv bootargs console=${console} root=${mmcroot}\0 "	\
@@ -111,8 +111,6 @@
 #define CONFIG_SYS_FSL_USDHC_NUM	2
 #define CONFIG_SYS_FSL_ESDHC_ADDR	0
 
-#define CONFIG_SYS_MMC_IMG_LOAD_PART	1
-
 #define CONFIG_SYS_BOOTM_LEN		SZ_128M
 
 #endif