Move the MARK_GRAPHICS_MEM_WRCOMB to x86 architecture

The MARK_GRAPHICS_MEM_WRCOMB was spreading like a cancer
since it was defined in sandybridge. It is really
more of an x86 thing however, and we now have
three systems that can use it.

I considered making this more general, since it technically
can apply to PTE-based systems like ARM, and maybe we should.
But the 'WRCOMB' moniker is usually closely tied to the x86.

Change-Id: I3eb6eb2113843643348a5e18e78c53d113899ff8
Signed-off-by: Ronald G. Minnich <rminnich@gmail.com>
Reviewed-on: http://review.coreboot.org/3349
Tested-by: build bot (Jenkins)

0 files changed, 0 insertions, 0 deletions