mb/google/skyrim: Enable tis_plat_irq_status

This will fix:
> [INFO ]  Probing TPM I2C: tis_plat_irq_status() not implemented, wasting 20ms to wait on Cr50!

BUG=b:224618411
TEST=Compile skyrim

Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: I5add694506ad089adcc8961f101bf507bc39a522
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62873
Reviewed-by: Jon Murphy <jpmurphy@google.com>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/skyrim/variants/baseboard/Makefile.inc

@@ -1,7 +1,11 @@
 bootblock-y += gpio.c
 
 romstage-y += gpio.c
+romstage-y += tpm_tis.c
 
 ramstage-y += gpio.c
+ramstage-y += tpm_tis.c
+
+verstage-y += tpm_tis.c
 
 smm-y += gpio.c

src/mainboard/google/skyrim/variants/baseboard/gpio.c

@@ -39,7 +39,7 @@ static const struct soc_amd_gpio base_gpio_table[] = {
 	/* SOC_SAR_INT_L */
 	PAD_SCI(GPIO_17, PULL_NONE, EDGE_LOW),
 	/* GSC_SOC_INT_L */
-	PAD_GPI(GPIO_18, PULL_NONE),
+	PAD_INT(GPIO_18, PULL_NONE, EDGE_LOW, STATUS_DELIVERY),
 	/* I2C3_SCL */
 	PAD_NF(GPIO_19, I2C3_SCL, PULL_NONE),
 	/* I2C3_SDA */

src/mainboard/google/skyrim/variants/baseboard/tpm_tis.c

@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <security/tpm/tis.h>
+#include <soc/gpio.h>
+
+int tis_plat_irq_status(void)
+{
+	return gpio_interrupt_status(GPIO_18);
+}