ARM: dts: imx6-tx6: disable the spi node by default

The spidev driver doesn't like to be instantiated via a naked 'spidev'
compatible, though it is very convenient to invoke it this way without
a dedicated SPI device for basic functional testing.
Disable the spi node by default to silence the WARN_ON() from the
spidev driver, but leave the configuration intact otherwise.
Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6qdl-tx6.dtsi

@@ -240,7 +240,7 @@ &ecspi1 {
 		&gpio2 30 GPIO_ACTIVE_HIGH
 		&gpio3 19 GPIO_ACTIVE_HIGH
 	>;
-	status = "okay";
+	status = "disabled";
 
 	spidev0: spi@0 {
 		compatible = "spidev";