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/imx8mq_cm.h b/include/configs/imx8mq_cm.h
index 938b13c..b099004 100644
--- a/include/configs/imx8mq_cm.h
+++ b/include/configs/imx8mq_cm.h
@@ -59,7 +59,7 @@
 	"fdt_file=imx8mq-cm.dtb\0" \
 	"initrd_addr=0x43800000\0"		\
 	"bootm_size=0x10000000\0" \
-	"mmcpart=" __stringify(CONFIG_SYS_MMC_IMG_LOAD_PART) "\0" \
+	"mmcpart=1\0" \
 	"mmcroot=" CONFIG_MMCROOT " rootwait rw\0" \
 
 /* Link Definitions */
@@ -89,6 +89,4 @@
 #define CONFIG_SYS_FSL_USDHC_NUM		2
 #define CONFIG_SYS_FSL_ESDHC_ADDR       0
 
-#define CONFIG_SYS_MMC_IMG_LOAD_PART	1
-
 #endif