arm/dt: msm9625: Add support for fixed SDC2 regulator

msm9625 CDP and MTP contain a fixed 2.95V regulator which
can be enabled/disabled via a PMIC GPIO. Add support
for this feature.

Change-Id: Ib36b17810519df0073ef38739baac4bdd61233dd
Signed-off-by: Oluwafemi Adeyemi <aadeyemi@codeaurora.org>