msm: Kconfig: msm9625: Enable LPM driver

Add the Low Power Management driver files to the tree. Also enable SCM
feature to be able to make calls to TZ since 9625 is a TZ enabled
target.

Change-Id: I0e012db6edf0b1c9cc4cf65be4149e8ec078253a
Signed-off-by: Girish Mahadevan <girishm@codeaurora.org>