Add USB overcurrent support. Adds a weak call for mainboards
that don't suport USB OC.
BUG=b:69229635
Change-Id: Ie54c7a2baa78f21cf1cd30d5ed70c8c832cf3674
Signed-off-by: Marc Jones <marcj303@gmail.com>
Reviewed-on: https://review.coreboot.org/22678
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>