msm: camera: isp: Use single composite stats mask for VFE32

For VFE40 and above versions there is support to handle
multiple composite masks for stats. VFE32 needs only one
composite stats mask enabled.

Change-Id: I4f431d827c2d644b630d746712bc6e334a033113
Signed-off-by: Venu Yeshala <vyeshala@codeaurora.org>