[coreboot] Patch merged into coreboot/master: e773c92 Make mainboard_ops and mainboard.c file optional

the following patch was just integrated into master:
commit e773c92ef44be12108c61ce342b0d48ad6c6ddd6
Author: Kyösti Mälkki 
Date:   Thu Nov 15 07:05:43 2012 +0200

Make mainboard_ops and mainboard.c file optional

This provides weak empty declaration for mainboard_ops.
    The struct chip_operations is not defined for __PRE_RAM__ so
    the declaration is also moved upwards in the output.

Change-Id: I101f0b8b9f0a55fb51a7c6475d53cc588c84026d
    Signed-off-by: Kyösti Mälkki 
    Reviewed-on: http://review.coreboot.org/1931
    Tested-by: build bot (Jenkins)
    Reviewed-by: Stefan Reinauer

See http://review.coreboot.org/1931 for details.

-gerrit