Fix GCC warnings

Summary: currently this is set in all the device trees, but it can easily be set in common

Test Plan: 8960 devices

Reviewers: synergy

Reviewed By: synergy

Differential Revision: http://review.codefirex.com/D287
Merge branch 'jb-devel-release' of github.com:codefireXperiment/device_htc_msm8960-common into jb-devel-release