ARM: dts: msm: switch over to RPM controlled regulators on msmkrypton

Switch control of PMD9635 regulators from direct SPMI control via
qpnp-regulator to indirect RPM control via rpm-regulator-smd for
msmkrypton. This ensures that requests made for these regulators are
aggregated by the RPM processor along with the requests from other
processors.

Modify the voltage range for SMPS 3. When using RPM control, it is safe
to allow requests down to retention levels because the RPM will be able to
enforce system wide contraints that the application processor cannot.

The voltage range when using qpnp-regulator was:
SMPS 3: 1125000 - 1125000 uV

Change this range to the following under RPM control:
SMPS 3: 675000 - 1125000 uV

Additionally, allow the voltage range for SMPS 4 to drop to 1800000.

Change-Id: Ib6e4438807d0863e53256880944e5c2fce8cfe13
Signed-off-by: Xiaozhe Shi <xiaozhes@codeaurora.org>