ARM: dts: imx7-mba7: Add SPI1_SS0 as chip select 3

ECSPI1.SS0 was missing in the list.
Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/nxp/imx/imx7-mba7.dtsi

@@ -209,9 +209,9 @@ &adc2 {
 
 &ecspi1 {
 	pinctrl-names = "default";
-	pinctrl-0 = <&pinctrl_ecspi1>;
+	pinctrl-0 = <&pinctrl_ecspi1>, <&pinctrl_ecspi1_ss0>;
 	cs-gpios = <&gpio4 0 GPIO_ACTIVE_LOW>, <&gpio4 1 GPIO_ACTIVE_LOW>,
-		   <&gpio4 2 GPIO_ACTIVE_LOW>;
+		   <&gpio4 2 GPIO_ACTIVE_LOW>, <&gpio4 19 GPIO_ACTIVE_LOW>;
 	status = "okay";
 };
 
@@ -357,6 +357,12 @@ pinctrl_ecspi1: ecspi1grp {
 			<MX7D_PAD_UART2_RX_DATA__GPIO4_IO2		0x74>;
 	};
 
+	pinctrl_ecspi1_ss0: ecspi1ss0grp {
+		fsl,pins = <
+			MX7D_PAD_ECSPI1_SS0__GPIO4_IO19			0x74
+		>;
+	};
+
 	pinctrl_ecspi2: ecspi2grp {
 		fsl,pins =
 			<MX7D_PAD_ECSPI2_MISO__ECSPI2_MISO		0x7c>,