msm: camera: ope: Updated logic to calculate num bw path

Ope driver was incorrectly calculating the number
of bw path. This is causing bw to be skip for some
of the ports.

Updated logic to correctly calculate number of path
based on valid path type.

CRs-Fixed: 2715586
Change-Id: I95b6dcfae454713a7b5db6d629310244bb304b19
Signed-off-by: Alok Chauhan <alokc@codeaurora.org>