msm: camera: Notify TZ App about changes of the HW security mode

The change adds a mechanism to send a notification down to TZ App
upon changes in the camera HW blocks security mode.

Change-Id: Iabc62e9e484717920bfec74a8799de3900a7215e
Signed-off-by: Alexander Kolesnikov <akolesni@codeaurora.org>