Move payload clean targets into payloads/Makefile.inc Add clean targets for coreinfo, nvramcui, Memtest86+ Change-Id: I70c13582311dfba3e309805053159f8a039cb109 Signed-off-by: Martin Roth <martinroth@google.com> Reviewed-on: https://review.coreboot.org/13940 Tested-by: build bot (Jenkins) Reviewed-by: Ben Gardner <gardner.ben@gmail.com> Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>