BCM270X: Disable VEC unless vc4-kms-v3d is present.

Signed-off-by: Eric Anholt <[email protected]>
(cherry picked from commit dabd52d)

Author: anholt

arch/arm/boot/dts/bcm2708-rpi.dtsi

@@ -155,3 +155,7 @@ sdhost_pins: &sdhost_gpio48 {
 &cpu_thermal {
 	/delete-node/ trips;
 };
+
+&vec {
+	status = "disabled";
+};