msm: camera: isp: Add code for new request frame command

Add code to handle the new request frame command that takes
a buffer index

CRs-Fixed: 1012335
Change-Id: I9dfdc185fda547eea8fccd8d463911a93e582931
Signed-off-by: Shubhraprakash Das <sadas@codeaurora.org>
Signed-off-by: Harsh Shah <harshs@codeaurora.org>