mb/google/rauru: Pass reset gpio parameter to BL31

Pass the reset gpio parameter to BL31 to support SoC reset.

BUG=b:334753311
TEST=run reboot command

Change-Id: I4ddecfb8f36a8f721b57ca16e6a861f933b058b4
Signed-off-by: Yidi Lin <yidilin@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/84933
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Reviewed-by: Yidi Lin <yidilin@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/rauru/mainboard.c

@@ -2,6 +2,7 @@
 
 #include <device/device.h>
 #include <gpio.h>
+#include <soc/bl31.h>
 #include <soc/pcie.h>
 #include <soc/usb.h>
 
@@ -23,6 +24,9 @@ static void mainboard_init(struct device *dev)
 {
 	setup_usb_host();
 	power_on_fpmcu();
+
+	if (CONFIG(ARM64_USE_ARM_TRUSTED_FIRMWARE))
+		register_reset_to_bl31(GPIO_AP_EC_WARM_RST_REQ.id, true);
 }
 
 static void mainboard_enable(struct device *dev)