soc/amd: factor out common acpi_add_ivrs_table implementation

Instead of open-coding this functionality in all AMD SoCs, factor it out
into a common implementation.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: Idb65c398b747e70ec67107e0a1d4bd6551501347
Reviewed-on: https://review.coreboot.org/c/coreboot/+/80208
Reviewed-by: Matt DeVillier <matt.devillier@amd.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Varshit Pandya <pandyavarshit@gmail.com>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>

src/soc/amd/genoa_poc/acpi.c

@@ -42,12 +42,7 @@ unsigned long soc_acpi_write_tables(const struct device *device, unsigned long c
 				    struct acpi_rsdp *rsdp)
 {
 	/* IVRS */
-	acpi_ivrs_t *ivrs;
-	current = acpi_align_current(current);
-	ivrs = (acpi_ivrs_t *)current;
-	acpi_create_ivrs(ivrs, acpi_fill_ivrs);
-	current += ivrs->header.length;
-	acpi_add_table(rsdp, ivrs);
+	current = acpi_add_ivrs_table(current, rsdp);
 
 	return current;
 }