msm: subsys-pil-tz: Add compatible field to subsys-pil-tz table

Add the compatible field to the pil_tz_match_table for other
subsystems to use. The compatible entry in the subsystem's device
tree node will need to be "qcom,pil-tz-generic" for enabling them
to use the generic PIL/SSR driver functionalities.

Change-Id: Ib52822304b4d7f9cfb8e7060c796e02eca3340b2
Signed-off-by: Deepak Katragadda <dkatraga@codeaurora.org>