mb/google/dedede/var/beadrix: Add LTE power off sequence

This change adds LTE power off sequence for beadrix.

BUG=b:204882915
BRANCH=dedede
TEST=FW_NAME=beadrix emerge-dedede coreboot

Change-Id: I11370bf69438465d2230e2633044ba42685a152b
Signed-off-by: Teddy Shih <teddyshih@ami.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/61329
Reviewed-by: Henry Sun <henrysun@google.com>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/dedede/variants/beadrix/Makefile.inc

@@ -3,3 +3,5 @@
 romstage-y += memory.c
 
 ramstage-y += gpio.c
+
+smm-y += variant.c

src/mainboard/google/dedede/variants/beadrix/variant.c

@@ -0,0 +1,23 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <acpi/acpi.h>
+#include <baseboard/variants.h>
+#include <delay.h>
+#include <gpio.h>
+
+static void power_off_lte_module(void)
+{
+	gpio_output(GPP_H17, 0);
+	mdelay(20);
+	gpio_output(GPP_A10, 0);
+}
+
+void variant_smi_sleep(u8 slp_typ)
+{
+	/*
+	 * Once the FW_CONFIG is provisioned, power off LTE module only under
+	 * the situation where it is stuffed.
+	 */
+	if (slp_typ == ACPI_S5)
+		power_off_lte_module();
+}