m8: update hardware keys overlay

Add volume rocker to device keys.

Change-Id: Ifc12387a18de9f476d3ea5cab3ea7812bfab77f4
Revert "sepolicy: set seclabel in init"

This commit breaks cellular data, causing baseband/imei/etc. to show "unknown"

This reverts commit 995ffe8a0c9e3fd57d4514ad76a606287d80c8b6.

Change-Id: Ia6aece25755f6262acba8dbb69a69db75306c1e3