mb/siemens/mc_rpl1: Set coreboot ready LED

This mainboard has an LED that shows when coreboot has finished. The LED
is switched on via GPIO GPP_F4.

TEST=LED turns on when booting to Payload.

Change-Id: Ia292b10573d67df3f288b97fa2e92ae85ba7f27b
Signed-off-by: Kilian Krause <kilian.krause@siemens.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/90201
Reviewed-by: Mario Scheithauer <mario.scheithauer@siemens.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/siemens/mc_rpl/variants/mc_rpl1/Makefile.mk

@@ -3,5 +3,6 @@
 bootblock-y += early_gpio.c
 ramstage-y += gpio.c
 romstage-y += variant.c
+ramstage-y += ramstage.c
 
 all-$(CONFIG_NC_FPGA_POST_CODE) += post.c

src/mainboard/siemens/mc_rpl/variants/mc_rpl1/ramstage.c

@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <bootstate.h>
+#include <gpio.h>
+
+static void finalize_boot(void *unused)
+{
+	/* Set coreboot ready LED. */
+	gpio_output(GPP_F4, 1);
+}
+
+BOOT_STATE_INIT_ENTRY(BS_PAYLOAD_BOOT, BS_ON_ENTRY, finalize_boot, NULL);