Bring back the status bar activity indicators for mobile data and wifi

Google were nice enough to create xxhdpi drawables for us before removing them.

Reverts "Remove signal/wifi activity indicator icon overlays."

This reverts commit fcc901c10bffdfb9c6b31e676dec36b47d949979.

Change-Id: I7aa85f7c8442c45d17e42cac7823dfe93e3f24c1
Forward port SystemUI: HSPA+ Support

Add the ability to recognize HSPA+ by creating a separate case for HSPAP and
include new H+ icons.

Signed-off-by: Bajee11 <bajee11@gmail.com>
Change-Id: I889a28e4b4cb49862b291641df5a00388db87551