msm: camera: return -EIO if daemon hasn't fully launched

Media server depends on camera daemon to be fully launched
to be able to get camera info. Return -EIO if daemon hasn't
subscribed to v4l2 device node. This gives HAL opportunity
to try again.

Bug: 10577806
Signed-off-by: Shuzhen Wang <shuzhenw@codeaurora.org>

Conflicts:

	drivers/media/platform/msm/camera_v2/msm.c