msm: rpm-regulator: Add PM8917 N1200 TCXO workaround support for 8960/8064

Add support into rpm-regulator-8960 for using the TCXO workaround
on PM8917 1200mA NLDOs on MSM8960 and APQ8064.  PM8917 regulators
L25, L26, L27, and L28 require that CXO be ON when they are
enabled.  Configure these regulators so that they operate
correctly on systems which utilize TCXO.

Change-Id: I7c25de3f32228c9a57ba4030211acb73ea7cbf5b
Signed-off-by: David Collins <collinsd@codeaurora.org>