arm64: dts: imx8mn-venice-gw7902: disable gpu

Since commit 99aa29932271 ("arm64: dts: imx8mn: Enable GPU")
imx8mn-venice-gw7902 will hang during kernel init because it uses
a MIMX8MN5CVTI which does not have a GPU.

Disable pgc_gpumix to work around this. We also disable the GPU devices
that depend on the gpumix power domain and pgc_gpu to avoid them staying
in a probe deferred state forever.

Cc: Adam Ford <aford173@gmail.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Fixes: 99aa29932271 ("arm64: dts: imx8mn: Enable GPU")
Reviewed-by: Adam Ford <aford173@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mn-venice-gw7902.dts

@@ -220,6 +220,10 @@ can@0 {
 	};
 };
 
+&disp_blk_ctrl {
+	status = "disabled";
+};
+
 /* off-board header */
 &ecspi2 {
 	pinctrl-names = "default";
@@ -251,6 +255,10 @@ ethphy0: ethernet-phy@0 {
 	};
 };
 
+&gpu {
+	status = "disabled";
+};
+
 &i2c1 {
 	clock-frequency = <100000>;
 	pinctrl-names = "default";
@@ -546,6 +554,10 @@ &i2c4 {
 	status = "okay";
 };
 
+&pgc_gpumix {
+	status = "disabled";
+};
+
 /* off-board header */
 &sai3 {
 	pinctrl-names = "default";