Add stub regulator devices for the SMPS, LDO, and BOB regulators
found on the PMIC chips which are used on Sun boards. This
ensures that consumers can use the regulators successfully.
Change-Id: I23a02c960adbb46b09c7648458d7c367636993c3
Signed-off-by: David Collins <quic_collinsd@quicinc.com>