msm: camera: reqmgr: Remove kfree calls on link struct

Links are statically allocated removing the kfree calls for
this struct.

Change-Id: Id912525e3617502233a25053c75ef92bfa03144f
Signed-off-by: Karthik Anantha Ram <kartanan@codeaurora.org>
Signed-off-by: Alok Chauhan <alokc@codeaurora.org>