Settings: add key to USB Storage Unmount option

If we want to be able to highlight this preference and we need a key to do so.

Change-Id: I8c78f8cf8e75bbc071438ef4f733f3ac49e27791
Signed-off-by: Roman Birg <roman@cyngn.com>
(cherry picked from commit 100e982f18889be12b70435b7729be994f320ef8)
Revert "Use actual storage type of sdcard/usb (2/2)."

This reverts commit 54e5aa5589d05fce844469e55f57e1d10fcbbc1b.

Conflicts:
	res/values/cm_strings.xml

(cherry picked from commit b15c2a880348539ae5169c57d407b5e755456730)
Settings: Improve touch sensivity string

Change-Id: I47cfb414af91657ed158b4010ffa0bbf21c0e8e9
(cherry picked from commit d900b7a98d4ce8b34476328a886ae96d6baa9699)