nb/intel/common: Create a common init_igd_opregion method

Copy Haswell's init_igd_opregion to common folder.
Remove platform specific code.
Will replace all Intel NB implementations.

Change-Id: I14dfb5986df264ffd71183a159f98b79e8e3230e
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/19905
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

0 files changed, 0 insertions, 0 deletions