msm: camera: exit camera incase axi gets timeout

AXI hits timeout while stopping due to sensor not streaming.
Simply returning error from here puts AXI and camif in still
running state whereas userspace proceeds with releasing the
buffers. This fix ensures we halt AXi and stop camif in sensor
not streaming case. Thus avoid page faults and a delay in
stopping camera.

Change-Id: I4159ac7b21d2a22a5684d7b4a614b0dfd8f06e46
Signed-off-by: Mohit Setia <msetia@codeaurora.org>