Add stub regulator devices for the SMPS, LDO, and BOB regulators
found on the PMICs used on kera boards to allow the regulator
clients to vote on them.
Change-Id: I1ff88145cdfb7111e473653d4a26e332f93267a8
Signed-off-by: Kavya Nunna <quic_knunna@quicinc.com>