msm: camera: Add Face Detection driver

Enable FD (Face Detection) driver to perform FD HW
functionality. This driver enables HW to process a
given frame to detect faces present in the fov.

Change-Id: I5c1b985d5f65f5613dcd39fb3b51169ad3442b76
Signed-off-by: Pavan Kumar Chilamkurthi <pchilamk@codeaurora.org>