armv8: ls1046ardb_emmc: Fix a typo in defconfig

It should be EMMC_BOOT instead of CONFIG_EMMC_BOOT.

Signed-off-by: York Sun <york.sun@nxp.com>
CC: Gong Qianyu <Qianyu.Gong@nxp.com>
Reviewed-by: Tom Rini <trini@konsulko.com>

configs/ls1046ardb_emmc_defconfig

@@ -6,7 +6,7 @@ CONFIG_SPL=y
 CONFIG_FIT=y
 CONFIG_FIT_VERBOSE=y
 CONFIG_OF_BOARD_SETUP=y
-CONFIG_SYS_EXTRA_OPTIONS="RAMBOOT_PBL,SPL_FSL_PBL,SYS_FSL_DDR4,CONFIG_EMMC_BOOT"
+CONFIG_SYS_EXTRA_OPTIONS="RAMBOOT_PBL,SPL_FSL_PBL,SYS_FSL_DDR4,EMMC_BOOT"
 CONFIG_SD_BOOT=y
 CONFIG_BOOTDELAY=10
 CONFIG_HUSH_PARSER=y