msm: camera: reqmgr: Validate num links in link control

This change vaildates num of links passed as part of link control
to avoid invalid memory access.

Change-Id: If389296dae01b2029fcdfd9db8a2de42460f7d75
Signed-off-by: Karthik Anantha Ram <kartanan@codeaurora.org>
Signed-off-by: Raja Mallik <rmallik@codeaurora.org>