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/imx8mn_beacon.h b/include/configs/imx8mn_beacon.h
index 63e8f5e..2843535 100644
--- a/include/configs/imx8mn_beacon.h
+++ b/include/configs/imx8mn_beacon.h
@@ -43,7 +43,7 @@
 	"fdt_file=" CONFIG_DEFAULT_FDT_FILE "\0" \
 	"initrd_addr=0x43800000\0"		\
 	"mmcdev=" __stringify(CONFIG_SYS_MMC_ENV_DEV) "\0" \
-	"mmcpart=" __stringify(CONFIG_SYS_MMC_IMG_LOAD_PART) "\0" \
+	"mmcpart=1\0" \
 	"finduuid=part uuid mmc ${mmcdev}:2 uuid\0" \
 	"mmcautodetect=yes\0" \
 	"mmcargs=setenv bootargs console=${console} " \
@@ -121,7 +121,6 @@
 /* USDHC */
 #define CONFIG_SYS_FSL_USDHC_NUM	2
 #define CONFIG_SYS_FSL_ESDHC_ADDR	0
-#define CONFIG_SYS_MMC_IMG_LOAD_PART	1
 
 /* ENET Config */
 #if defined(CONFIG_FEC_MXC)