Patch merged into coreboot/master: payloads/Makefile.inc: Clean up Makefile

the following patch was just integrated into master:
commit e68a4385d4e8d9e247ac1f09d406fd2fb4e9b1de
Author: Martin Roth 
Date:   Wed Mar 16 10:45:35 2016 -0600

payloads/Makefile.inc: Clean up Makefile

- Instead of adding each payload to each common target, create a list
    and loop through the list for all of the payloads
    - '.phony' doesn't work - the target needs to be uppercase '.PHONY'

Change-Id: I4a7712c94d0f127c2fff8cb8fada4b8132a4ab3b
    Signed-off-by: Martin Roth 
    Reviewed-on: https://review.coreboot.org/14131
    Tested-by: build bot (Jenkins)
    Reviewed-by: Stefan Reinauer

See https://review.coreboot.org/14131 for details.

-gerrit