msm: subsys-pil-tz: Move lpass PIL/SSR support to generic PIL/SSR driver

The need for a seperate lpass PIL/SSR driver goes away with
leveraging the functionality of the generic PIL/SSR driver.

Change-Id: I3a1f21eddd309499e56637459f3f59ebce350e06
Signed-off-by: Deepak Katragadda <dkatraga@codeaurora.org>