Specifying a build target only applies to UefiPayloadPkg, so guard it
against the relevant Kconfig option.
Signed-off-by: Sean Rhodes <sean@starlabs.systems>
Change-Id: Ia4597b5ed76616e39cec45f8a69be9f1ccd72d4c
Reviewed-on: https://review.coreboot.org/c/coreboot/+/68182
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>