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: I830d0881e370f146dd691ec91733822ff34551eb
Signed-off-by: Yash Upadhyay <quic_yupadhya@quicinc.com>
Signed-off-by: Sridhar Gujje <quic_sgujje@quicinc.com>