Revert "gigabyte/ga-b75m-d3h: Add new Intel mainboard"

Breaks abuild and is dependent on WIP, is WIP itself.

This reverts commit d7d0c8134854cba72f0c3fe25946b27ce0364b43.

Change-Id: I8b589b41632696aa4570abcceab5f3a3b0784649
Signed-off-by: Vladimir Serbinenko  <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/7319
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Tested-by: build bot (Jenkins)