msm: camera: reqmgr: Validate the link handle

Instead of correct link handle, if some other handle like
dev handle is passed then it may access some other data space.
To avoid such scenario, need to check whether link handle
passed by ioctl is same as retrieved link handle.

CRs-Fixed: 3120454
Change-Id: Iba06559b265f164d7f815e1ed362d6874b3218ee
Signed-off-by: Yash Upadhyay <quic_yupadhya@quicinc.com>