Revert "camera: Fix loss of focus mode between shots"

This reverts commit 40279ba1fd2d4f02d889699df1eccf3d3a01df55.

V4L2_CID_CAMERA_FOCUS_MODE has the side effect of resetting the
sensor AF position. Hence, the focus is lost each time SetParameters
is called and this happens during a snapshot resulting in out of
focus pictures.

Change-Id: Ia644b62e3752196c0637053150af7899155d6a47