Drop add_mainboard_resources and HAVE_MAINBOARD_RESOURCES again

These are not defined since commit »Drop HAVE_MAINBOARD_RESOURCES«
(1c5071d1) [1] but were unfortunately introduced again in new ports.

[1] http://review.coreboot.org/1414

Change-Id: I5eb61628141aefd08779615702d51ca155fa632a
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/2707
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
5 files changed