libgenlock: Remove the call to GENLOCK_IOC_RELEASE.

The GENLOCK_IOC_RELEASE ioctl is now deprecated. This was done because to
avoid race conditions where the handle was released before another client
tried to unlock it.

(cherry picked from commit d151435)

Change-Id: Iaf433a79dd0dad992cbf67180765718beec4eb1c
CRs-fixed: 333141

libgenlock/genlock.cpp

@@ -186,12 +186,6 @@ genlock_status_t genlock_release_lock(native_handle_t *buffer_handle)
             return GENLOCK_FAILURE;
         }
 
-        if (ioctl(hnd->genlockPrivFd, GENLOCK_IOC_RELEASE, NULL)) {
-            LOGE("%s: GENLOCK_IOC_RELEASE failed (err=%s)", __FUNCTION__,
-                    strerror(errno));
-            ret = GENLOCK_FAILURE;
-        }
-
         // Close the fd and reset the parameters.
         close_genlock_fd_and_handle(hnd->genlockPrivFd, hnd->genlockHandle);
     }