msm: camera: isp: Dynamic update of epoch0 line config

Currently epoch0 is configured to 20 lines from start of frame,
this change dynamically updates the configuration based on the
chosen sensor dimension for a given use case.

Change-Id: I66474c39ea19b83a2137e5f2417a2cef88164a5b
Signed-off-by: Karthik Anantha Ram <kartanan@codeaurora.org>