msm-camera: Avoid adding top up to calulated ab/ib for single stream.

Avoiding topup for ab/ib for single stream

Change-Id: Ie6fb6716ea1b30604d801936bea3da5a96d8a6fc
Signed-off-by: Chandan Gera <cgera@codeaurora.org>
Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>