Swap volume buttons when the screen is rotated (2/2)

Patch Set 7: Hide option if device not supported

Patch Set 8: Fix string derp introduced on ps7

Patch Set 9: Invert the orientation interpretations on tablets

Change-Id: Ie2166a4d50050e7a60933251bfc8cda97c42d419

Conflicts:
	res/values/strings.xml