drm/imx: ipuv3-plane: Remove redundant color encoding and range initialisation

The imx KMS driver will call drm_plane_create_color_properties() with
a default encoding and range values of BT601 and Limited Range,
respectively.

Since the initial value wasn't carried over in the state, the driver had
to set it again in ipu_plane_state_reset(). However, the helpers have been
adjusted to set it properly at reset, so this is not needed anymore.

Cc: linux-arm-kernel@lists.infradead.org
Cc: NXP Linux Team <linux-imx@nxp.com>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: Pengutronix Kernel Team <kernel@pengutronix.de>
Cc: Philipp Zabel <p.zabel@pengutronix.de>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Link: https://lore.kernel.org/r/20220221095918.18763-22-maxime@cerno.tech

drivers/gpu/drm/imx/ipuv3-plane.c

@@ -308,11 +308,8 @@ static void ipu_plane_state_reset(struct drm_plane *plane)
 
 	ipu_state = kzalloc(sizeof(*ipu_state), GFP_KERNEL);
 
-	if (ipu_state) {
+	if (ipu_state)
 		__drm_atomic_helper_plane_reset(plane, &ipu_state->base);
-		ipu_state->base.color_encoding = DRM_COLOR_YCBCR_BT601;
-		ipu_state->base.color_range = DRM_COLOR_YCBCR_LIMITED_RANGE;
-	}
 }
 
 static struct drm_plane_state *