payloads/coreinfo: Set KCONFIG_CONFIG value

The KCONFIG_CONFIG value was previously keeping the value set by
coreboot's makefile. That caused it to overwrite coreboot's .config,
making the current coreinfo build and the next coreboot build fail
with the curious error that you were building without the correct
toolchain.

Change-Id: I973b0c36e7227135a5c2d6d261e08889857aaaf1
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/16023
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Omar Pakker
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
1 file changed