msm: camera: Release spinlock in error case

In error case we exit msm_isp_axi_wait_for_cfg_done api without
releasing the spin lock and then we try to take a mutex.
In case mutex is taken by some other thread.
This will make the current thread to sleep and this leads to
CPU core sleep

Change-Id: Id410c96dd01eb18443080e0fb69c655cfce163d9
Signed-off-by: Senthil Kumar Rajagopal <skrajago@codeaurora.org>
Signed-off-by: Nagesh Subba Reddy <nageshsreddy@codeaurora.org>