msm: camera: Avoid multiple stop calls to CPAS

Multiple CCI clients release trigger release at CCI, make sure CPAS stop
triggered only for last client.

Change-Id: Ie6d096d5ee92efe46390d306dbce777a1d63a103
Signed-off-by: Viswanadha Raju Thotakura <viswanad@codeaurora.org>