Initial IGD OpRegion implementation

Change-Id: I9e57c5792409830895a1147799acab95d910a336
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/1757
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
4 files changed