Patch merged into coreboot/master: payloads: Reorganize Makefile.incs for external payloads

the following patch was just integrated into master:
commit 0fa5d8f219a016d58e4592c268730d0f45a2835b
Author: Stefan Reinauer 
Date:   Tue Jun 30 17:09:17 2015 -0700

payloads: Reorganize Makefile.incs for external payloads

This is not going as far as I would like it to go, but
    some of the external payloads have to be fixed up first.
    Long term, I would like to  directly add payloads/external/*
    to subdirs-y and remove one layer of indirection from the
    build process.

For now, moving the payload Makefile targets into payloads/
    is already a small improvement.

Change-Id: Ie4eb492eb804e0aaaf1a4d90af2f876f27a32a75
    Signed-off-by: Stefan Reinauer 
    Reviewed-on: http://review.coreboot.org/10829
    Reviewed-by: Martin Roth 
    Tested-by: build bot (Jenkins)
    Reviewed-by: Patrick Georgi

See http://review.coreboot.org/10829 for details.

-gerrit