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
Merge branch 'cm-10.1' of https://github.com/BeerGang/android_packages_apps_Settings into cm-10.1