imx6: engicam: Drop SPL_EXT_SUPPORT

i.MX6 boards still using raw MMC write for SPL and
u-boot-dtb.img along with Falcon mode configurations,
so drop filesystem based write through SPL_EXT_SUPPORT.
Signed-off-by: NJagan Teki <jagan@amarulasolutions.com>

configs/imx6qdl_icore_mipi_defconfig

@@ -18,7 +18,6 @@ CONFIG_FIT_VERBOSE=y
 CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=arch/arm/mach-imx/spl_sd.cfg"
 CONFIG_BOOTDELAY=3
 CONFIG_SPL=y
-CONFIG_SPL_EXT_SUPPORT=y
 CONFIG_SPL_OS_BOOT=y
 CONFIG_HUSH_PARSER=y
 CONFIG_SYS_PROMPT="icorem6qdl-mipi> "

configs/imx6qdl_icore_mmc_defconfig

@@ -18,7 +18,6 @@ CONFIG_FIT_VERBOSE=y
 CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=arch/arm/mach-imx/spl_sd.cfg"
 CONFIG_BOOTDELAY=3
 CONFIG_SPL=y
-CONFIG_SPL_EXT_SUPPORT=y
 CONFIG_SPL_OS_BOOT=y
 CONFIG_HUSH_PARSER=y
 CONFIG_SYS_PROMPT="icorem6qdl> "

configs/imx6qdl_icore_rqs_defconfig

@@ -17,7 +17,6 @@ CONFIG_FIT_VERBOSE=y
 CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=arch/arm/mach-imx/spl_sd.cfg"
 CONFIG_BOOTDELAY=3
 CONFIG_SPL=y
-CONFIG_SPL_EXT_SUPPORT=y
 CONFIG_SPL_OS_BOOT=y
 CONFIG_HUSH_PARSER=y
 CONFIG_SYS_PROMPT="icorem6qdl-rqs> "

configs/imx6ul_geam_mmc_defconfig

@@ -17,7 +17,6 @@ CONFIG_FIT_VERBOSE=y
 CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=arch/arm/mach-imx/spl_sd.cfg"
 CONFIG_BOOTDELAY=3
 CONFIG_SPL=y
-CONFIG_SPL_EXT_SUPPORT=y
 CONFIG_HUSH_PARSER=y
 CONFIG_SYS_PROMPT="geam6ul> "
 CONFIG_CRC32_VERIFY=y

configs/imx6ul_isiot_emmc_defconfig

@@ -17,7 +17,6 @@ CONFIG_FIT_VERBOSE=y
 CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=arch/arm/mach-imx/spl_sd.cfg"
 CONFIG_BOOTDELAY=3
 CONFIG_SPL=y
-CONFIG_SPL_EXT_SUPPORT=y
 CONFIG_HUSH_PARSER=y
 CONFIG_SYS_PROMPT="isiotmx6ul> "
 CONFIG_CRC32_VERIFY=y