soc/amd/stoneyridge/acpi: introduce and use ACPI_SCI_IRQ definition

IRQ9 is used as ACPI SCI IRQ, so add a define for that and use it in the
code like it is also done in the other SoCs in soc/amd.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: Iddb51d70c15ab1d7088f62b61e22510bd1b30b1e
Reviewed-on: https://review.coreboot.org/c/coreboot/+/73320
Reviewed-by: Matt DeVillier <matt.devillier@amd.corp-partner.google.com>
Reviewed-by: Martin Roth <martin.roth@amd.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/amd/stoneyridge/acpi.c

@@ -40,7 +40,7 @@ unsigned long acpi_fill_madt(unsigned long current)
 			MP_IRQ_TRIGGER_DEFAULT | MP_IRQ_POLARITY_DEFAULT);
 	/* SCI IRQ type override */
 	current += acpi_create_madt_irqoverride((acpi_madt_irqoverride_t *)current,
-			MP_BUS_ISA, 9, 9,
+			MP_BUS_ISA, ACPI_SCI_IRQ, ACPI_SCI_IRQ,
 			MP_IRQ_TRIGGER_LEVEL | MP_IRQ_POLARITY_LOW);
 
 	return current;
@@ -54,7 +54,7 @@ void acpi_fill_fadt(acpi_fadt_t *fadt)
 {
 	printk(BIOS_DEBUG, "pm_base: 0x%04x\n", ACPI_IO_BASE);
 
-	fadt->sci_int = 9;		/* IRQ 09 - ACPI SCI */
+	fadt->sci_int = ACPI_SCI_IRQ;
 
 	if (permanent_smi_handler()) {
 		fadt->smi_cmd = APM_CNT;

src/soc/amd/stoneyridge/include/soc/acpi.h

@@ -6,6 +6,8 @@
 #include <acpi/acpi.h>
 #include <amdblocks/acpi.h>
 
+#define ACPI_SCI_IRQ 9
+
 #if CONFIG(STONEYRIDGE_LEGACY_FREE)
 	#define FADT_BOOT_ARCH ACPI_FADT_LEGACY_FREE
 #else