drm/mediatek: dsi: Add atomic {destroy,duplicate}_state, reset callbacks

Add callbacks for atomic_destroy_state, atomic_duplicate_state and
atomic_reset to restore functionality of the DSI driver: this solves
vblank timeouts when another bridge is present in the chain.

Tested bridge chain: DSI <=> ANX7625 => aux-bus panel

Fixes: 7f6335c6 ("drm/mediatek: Modify dsi funcs to atomic operations")
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Tested-by: Chen-Yu Tsai <wenst@chromium.org>
Reviewed-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Tested-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Link: https://patchwork.kernel.org/project/linux-mediatek/patch/20220721172727.14624-1-angelogioacchino.delregno@collabora.com/Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>

drivers/gpu/drm/mediatek/mtk_dsi.c

@@ -808,10 +808,13 @@ static void mtk_dsi_bridge_atomic_post_disable(struct drm_bridge *bridge,
 
 static const struct drm_bridge_funcs mtk_dsi_bridge_funcs = {
 	.attach = mtk_dsi_bridge_attach,
+	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
 	.atomic_disable = mtk_dsi_bridge_atomic_disable,
+	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
 	.atomic_enable = mtk_dsi_bridge_atomic_enable,
 	.atomic_pre_enable = mtk_dsi_bridge_atomic_pre_enable,
 	.atomic_post_disable = mtk_dsi_bridge_atomic_post_disable,
+	.atomic_reset = drm_atomic_helper_bridge_reset,
 	.mode_set = mtk_dsi_bridge_mode_set,
 };