msm: camera: update proportional UB size and changing stats Ub size

To have better bus usage,
we need to enable proportional allocation.
The UB size is updated according to HW version in isp46.

Change-Id: I22a2e03798848f882987177add2015f33490631e
Signed-off-by: Senthil <skrajago@codeaurora.org>