msm: camera: isp: Simplify updating burst count in reset case

During axi reset burst count value needs to be restored.
It can be updated directly without a call to the framedrop API.
This simplifies code logic and avoids unnecessay initializations
needed when using the API.

Change-Id: Ib13a2af724517b74aa0842cb72c833fb1f643920
CRs-fixed: 708260
Signed-off-by: Venu Yeshala <vyeshala@codeaurora.org>