msm: camera: ife: Remove line start addition

This change removes line start addition to epoch line config.
After CSID crop is applied, the first line that CAMIF
receives is already at the required line and therefore number
of lines for epoch should just be half of the frame width.

CRs-Fixed: 2546941
Change-Id: Ib12b1fc96cedf140672af03862aaf4be65ab38d8
Signed-off-by: Venkat Chinta <vchinta@codeaurora.org>