Camera: set default focus and metering areas to null.

Earlier, default values were not null which
is not compatiable with our HAL.

Change-Id: I317836b3289b9976bf281c8c74308969cbab626c
Camera: Request for 2 snapshots in HDR Mode.

Request for 2 snapshots(1x exposure, HDR Processed) images to be
stored on the SD Card.

Change-Id: Ie7b553e7dd7bf8e03edcf9eb7c09c5e28bacc1ab
(cherry picked from commit 1eebfba9e64ce6800209933063bc50336102dfd8)