msm: Move PIL and SSR drivers to drivers/soc/msm

Architectural changes in the ARM Linux kernel architecture
require that SoC specific drivers no longer live in mach-*
directories. Move the PIL and SSR drivers to drivers/soc/qcom.

Change-Id: Ic6c4ab9521db4b4e9c7af74e33ddda30c38822e0
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>