coreinfo: Build libpayload in coreinfo directory

When building libpayload, make the build directory and .config outside
libpayload source directory so it'll not pollute the libpayload source
and cause conflicts with other builds.

Change-Id: Idcfbc7dbe4d52a3559229d8450c3efaafd33b93b
Signed-off-by: Iru Cai <mytbk920423@gmail.com>
Reviewed-on: https://review.coreboot.org/14389
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
1 file changed