mb/siemens/mc_ehl2: Configure SD card detect pin in devicetree

This configures GPIO GPP_G5 as an input pin for SD card detect.

Change-Id: I708eb112fa054f2f88857001c409fb62493b6206
Signed-off-by: Mario Scheithauer <mario.scheithauer@siemens.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58855
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
diff --git a/src/mainboard/siemens/mc_ehl/variants/mc_ehl2/devicetree.cb b/src/mainboard/siemens/mc_ehl/variants/mc_ehl2/devicetree.cb
index 701efb4..0ff38d7 100644
--- a/src/mainboard/siemens/mc_ehl/variants/mc_ehl2/devicetree.cb
+++ b/src/mainboard/siemens/mc_ehl/variants/mc_ehl2/devicetree.cb
@@ -92,6 +92,9 @@
 	register "ScsEmmcDdr50Enabled" = "1"
 	register "SdCardPowerEnableActiveHigh" = "1"
 
+	# GPIO for SD card detect
+	register "sdcard_cd_gpio" = "GPP_G5"
+
 	# LPSS Serial IO (I2C/UART/GSPI) related UPDs
 	register "SerialIoI2cMode" = "{
 		[PchSerialIoIndexI2C0] = PchSerialIoPci,