m7-common: Set preferred AAPT density

* Set only XXHDPI

Change-Id: I9dd2674ecc9391f2d2465b5ad688881b8f877f43
Revert "Revert "m7-common: use permissive SELinux""

* Disable SELinux for bringup

This reverts commit 8795b860c38a01d9e776590aadec2ab6ee07192f.

Change-Id: I34b6435e2112ac5a6b41b76fc2ae4601cbe42d94
m7-common: Remove deprecated flags

Change-Id: Ibb68790574bbbd2ebe8b3fd0f25b96381d6e3b8c
m7-common: Reset file mode on init.qcom.usb.rc

Change-Id: I1e1437eb7c36f97bdf94dba0e1a34452710966a2
m7-common: Import init.target.rc

* init no longer performs this by default, import it manually.

Change-Id: Ic00fa3e2d7a68308b73312356e013796aa0ec299