arm: dts: imx8mm-venice-gw7903: add dig1_ctl and dig2_ctl gpios

The GW7903 revision B adds two additional GPIO's to control the
direction of the 2 isolated digital I/O circuits.

Define them as:
 - dig1_ctl
 - dig2_ctl

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
diff --git a/arch/arm/dts/imx8mm-venice-gw7903.dts b/arch/arm/dts/imx8mm-venice-gw7903.dts
index a7dae9b..1b69ac0 100644
--- a/arch/arm/dts/imx8mm-venice-gw7903.dts
+++ b/arch/arm/dts/imx8mm-venice-gw7903.dts
@@ -250,7 +250,7 @@
 };
 
 &gpio2 {
-	gpio-line-names = "dig2_in", "dig2_out#", "", "", "", "", "", "",
+	gpio-line-names = "dig2_in", "dig2_out#", "dig2_ctl", "", "", "", "dig1_ctl", "",
 		"dig1_out#", "dig1_in", "", "", "", "", "", "",
 		"", "", "", "", "", "", "", "",
 		"", "", "", "", "", "", "", "";
@@ -630,6 +630,8 @@
 			MX8MM_IOMUXC_GPIO1_IO12_GPIO1_IO12	0x40000041 /* RS232# */
 			MX8MM_IOMUXC_SD1_DATA7_GPIO2_IO9	0x40000041 /* DIG1_IN */
 			MX8MM_IOMUXC_SD1_DATA6_GPIO2_IO8	0x40000041 /* DIG1_OUT */
+			MX8MM_IOMUXC_SD1_DATA4_GPIO2_IO6	0x40000041 /* DIG1_CTL */
+			MX8MM_IOMUXC_SD1_DATA0_GPIO2_IO2	0x40000041 /* DIG2_CTL */
 			MX8MM_IOMUXC_SD1_CLK_GPIO2_IO0		0x40000041 /* DIG2_IN */
 			MX8MM_IOMUXC_SD1_CMD_GPIO2_IO1		0x40000041 /* DIG2_OUT */
 			MX8MM_IOMUXC_ECSPI1_MOSI_GPIO5_IO7	0x40000041 /* SIM1DET# */