msm: camera: Enable more than one composite stats in VFE46

Currently only one composite group of stats can be configured.
But if target supports added logic to form multiple composite masks
userspace will send composite group id along with stats stream info,
kernel will create composite masks and write to registers in VFE46.
This change add supports for multiple composite masks.

Change-Id: I27ffe0194fe4ab28b636b00b0213cdc7c6d5b75b
Signed-off-by: Senthil <skrajago@codeaurora.org>