ARM: dts: msm: Add labels to PIL entries for sdmshrike

Provide labels for PIL entries on the sdmshrike target.
Add a node to invoke the SSC sensors driver.

Change-Id: Ib39f4e03afdde92e5f3e3c73949ffb76c496e7f3
Signed-off-by: Anant Goel <anantg@codeaurora.org>