CameraWrapper: add support for metering mode

Change-Id: Ic192c7fd545759d2d6beb039aba64b60abdb0e21
CameraWrapper: set sony-focus-area correctly

When we touch the screen to set a focus area, this
parameter needs to be set to "user" instead of the
default value "center".
This is the behavior of stock Camera app, but it's
not making significant improvements here...just to
make sure it does not go wrong.

Change-Id: I0bdf320067d571fdb5619a2a4ba1feb8ace15edf
Revert "restore Camera(2) overlay"

* Not needed anymore, everything is moved to the Camera app

This reverts commit f83d439388a0047d15f0721f955a8bead5a6bace.

Change-Id: I5f2adf75a89cf6c4029267e5e01bc9aa81737373
RIL: HSPAP_DC in Sony 4.4 is now 19 as 18 is used by CAF for IWLAN RAT

Change-Id: Id5db3eb5df927a44c7658f1c89378af3306aaef3