soc/amd: move acpi_add_fsp_tables implementation to common FSP code

Since the acpi_add_fsp_tables implementation is identical for all SoCs,
factor it out and move it to the common AMD FSP code. Also guard the
acpi_add_fsp_tables call in soc_acpi_write_tables with
if (CONFIG(PLATFORM_USES_FSP2_0)) to properly handle the FSP dependency.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I8917a346f586e77b3b3278c73aed8cf61f3c9e6a
Reviewed-on: https://review.coreboot.org/c/coreboot/+/80225
Reviewed-by: Matt DeVillier <matt.devillier@amd.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/amd/phoenix/acpi.c

@@ -66,7 +66,8 @@ unsigned long soc_acpi_write_tables(const struct device *device, unsigned long c
 	/* IVRS */
 	current = acpi_add_ivrs_table(current, rsdp);
 
-	current = acpi_add_fsp_tables(current, rsdp);
+	if (CONFIG(PLATFORM_USES_FSP2_0))
+		current = acpi_add_fsp_tables(current, rsdp);
 
 	return current;
 }