disp: msm: sde: add client pre_release/post_acquire handles for VM layers

client_pre_release/client_post_acquire hooks in vm_ops allows non-SDE
clients to register for callbacks to be invoked
 - before releasing the resources from the current VM so that
   the client can updates the respective sw state to indicate
   the absence of HW ownership
 - before the first frame push after acquiring the HW to update
   reset the respective sw state to indicate the presence of
   HW ownership and resume operations

Change-Id: I93e5a2b43c79b4e7cc28e6e0129d8091aa0e508d
Signed-off-by: Jeykumar Sankaran <jsanka@codeaurora.org>

msm/sde/sde_vm_primary.c

@@ -254,6 +254,8 @@ static void _sde_vm_set_ops(struct sde_vm_ops *ops)
 {
 	memset(ops, 0, sizeof(*ops));
 
+	ops->vm_client_pre_release = sde_vm_pre_release;
+	ops->vm_client_post_acquire = sde_vm_post_acquire;
 	ops->vm_release = _sde_vm_release;
 	ops->vm_owns_hw = sde_vm_owns_hw;
 	ops->vm_deinit = _sde_vm_deinit;