U-Boot make target set to empty string does not expand correctly for
mainline BSP build, which append make target with 'flash.bin' entry.
This causes the build to fail, since the u-boot.bin target is not
produced when only 'flash.bin' is present in the make target list.
Define the default make target to 'all', which allows proper build
target expansion.
Fixes: 823a97cf ("imx8mp-lpddr4-evk: Rework 8M Plus EVK config file")
Signed-off-by: Andrey Zhizhikin <andrey.z@gmail.com>
LOADADDR = ""
UBOOT_SUFFIX = "bin"
-UBOOT_MAKE_TARGET = ""
+UBOOT_MAKE_TARGET = "all"
IMX_BOOT_SEEK = "32"
OPTEE_BIN_EXT = "8mp"