msm8226-common: Add platform-specific SELinux policy

Change-Id: I022c335fb18947bd8aa763a8782830f6941b904a
Revert "msm8226-common: Set SELinux to permissive mode"

This reverts commit a803395ed6607f1e23a589e8384ac6459dbb2e60.

Change-Id: Ifd7f12a4c71185d34d8992ad9ace1a0652d4a653