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 <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/14131
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
1 file changed