Add hdpi & mdpi images for QuickSettings Tiles

PS2: add disabled GPS icon & code
PS3: move GPS and Data strings to XML
PS4: typo... sry

Change-Id: I632d5a81b8463ac94103c3d6d878c7ea92e7bd4e
Signed-off-by: Gergely Szell (sethyx) <szell@hu.ibm.com>

Conflicts:
	packages/SystemUI/res/layout/quick_settings_tile_location.xml
	packages/SystemUI/res/values/strings.xml