soc/intel/braswell: Add USB2 phy setting override

Adapted from Chromium commit 9756af8.

Create hook function to override USB2 phy setting from board level.

Original-Change-Id: Ic736dd945f01cf9f24af4ce3bd3f2757abfdeb2e
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Original-Tested-by: Keith Tzeng <keith.tzeng@quantatw.com>

Change-Id: If2ac687f6fc44e4c022a72eea7f08cb6385f0380
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/21372
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
2 files changed