msm: camera: isp: report last buf done req for rdi and fs2

Report last buf done request id for rdi only use case and
FS2 use case to reset the request slot in CRM.

Change-Id: I6e911f8ac725eba3175ab088ffc9759671b2c328
Signed-off-by: Tejas Prajapati <tpraja@codeaurora.org>