Add register access support using register scripts.
Initialize the USB PHY using register scripts.
TEST=Build and run on Galileo Gen2
Change-Id: I34a8e78eab3c7314ca34343eccc8aeef0622798a
Signed-off-by: Lee Leahy <leroy.p.leahy@intel.com>
Reviewed-on: https://review.coreboot.org/14496
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>