msm: camera: Enable more than one composite stats

Currently only one composite group of stats can be configured.
However 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.

Change-Id: Iabeb553470e78252fdfaf280b31305be9698af50
Signed-off-by: Sagar Gore <sgore@codeaurora.org>