drivers: soc: qcom: Add snapshot of boot stats driver

Snapshot of boot stats driver as of msm-4.14 commmit <faf8976>
(Merge "Revert "msm: ADSPRPC: Add early wake up signal support"")

This driver is useful to debug the bootloader KPIs.

Change-Id: I0488247acef0c50d777b05d1605f93cbbae32abd
Signed-off-by: Murali Nalajala <mnalajal@codeaurora.org>