msm: 9625: Initialize LPM driver

Initialize the Low Power Management driver for 9625 from the board file.
This driver will allow the target to be put in a low power mode based on
the sleep time available. The LPM driver should initialize after the RPM
driver has been initialized.

Signed-off-by: Girish Mahadevan <girishm@codeaurora.org>
Change-Id: Ic345cf363623cbbee044c8d3a54795f84e19f9eb