ARM: dts: gemini: Set DIR-685 SPI CS as active low

[ Upstream commit f90b8fda ]

The SPI to the display on the DIR-685 is active low, we were
just saved by the SPI library enforcing active low on everything
before, so set it as active low to avoid ambiguity.

Link: https://lore.kernel.org/r/20190715202101.16060-1-linus.walleij@linaro.org
Cc: stable@vger.kernel.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

arch/arm/boot/dts/gemini-dlink-dir-685.dts

@@ -65,7 +65,7 @@ spi {
 		gpio-miso = <&gpio1 8 GPIO_ACTIVE_HIGH>;
 		gpio-mosi = <&gpio1 7 GPIO_ACTIVE_HIGH>;
 		/* Collides with pflash CE1, not so cool */
-		cs-gpios = <&gpio0 20 GPIO_ACTIVE_HIGH>;
+		cs-gpios = <&gpio0 20 GPIO_ACTIVE_LOW>;
 		num-chipselects = <1>;
 
 		panel: display@0 {