msm: camera: Call SCM system call while CSID clock active

SCM system call is for TZ which in turn reads secure mode and
HVX registers while CSID clock is active.

Change-Id: I5f5d2c88f1fcf49ae6dd1f43b89a92e3307f54b0
Signed-off-by: Shadul Shaikh <sshadu@codeaurora.org>