msm: copper: Add regulator devices for stub-regulator driver

stub-regulator is a dummy regulator driver that is used until
the real implementation is complete. Add all the regulator devices
used in copper with their corresponding attributes.

Change-Id: I28d1077efa913b4901d7387f9b60f240f3325aef
Signed-off-by: Michael Bohan <mbohan@codeaurora.org>