soc/intel/braswell/acpi: Clean OpRegion up

Reorder code and put platform specific bits into update_igd_opregion.
Get rid of get_fsp_vbt and init_igd_opregion.
Write GMA opregion in case a VBT was provided, even when no FSP_GOP
is to be run.
Use SOC_INTEL_COMMON_GFX_OPREGION to reduce code duplication.

Change-Id: Ibabeb05a9d3d776b73f6885dcca846d5001116e7
Signed-off-by: Patrick Rudolph <>
Tested-by: build bot (Jenkins) <>
Reviewed-by: Matt DeVillier <>
Reviewed-by: Paul Menzel <>
3 files changed