disp: msm: replace kzfree with kfree

This change replaces kzfree with kfree as kzfree has been
renamed.

While moving to the latest 5.10 tip, additional small changes
were required to resolve compilation issues:

set_dma_ops has moved from dma-mapping to dma-map-ops header.
This change includes the new header file required.

drm_panel_add returns void, this change removes the expected
return value check.

drm_prime_pages_to_sg takes an additional parameter. This change
passes in the drm_device pointer the function is looking for.

Remove an unused variable in sde_crtc vblank function.

Change-Id: I47c085c0cb64432873c2e750ae64cbdc2b5340da
Signed-off-by: Samantha Tran <samtran@codeaurora.org>

msm/sde/sde_crtc.c

@@ -6286,7 +6286,6 @@ static void vblank_ctrl_worker(struct kthread_work *work)
 	struct vblank_work *cur_work = container_of(work,
 					struct vblank_work, work);
 	struct msm_drm_private *priv = cur_work->priv;
-	struct msm_kms *kms = priv->kms;
 
 	sde_crtc_vblank(priv->crtcs[cur_work->crtc_id], cur_work->enable);