msm: camera: isp: Improve the CSID resource allocation logic

This change improves the CSID resource allocation logic during the CSID
hardware resource allocation. In addition to the existing criteria,
pixel resource requirement has been added as a new criterion.

Change-Id: I2283d675f42429427e8200e172a08c05e3c1e210
Signed-off-by: Jing Zhou <jzhou70@codeaurora.org>