soc/amd: Move southbridge_write_acpi_tables

This is common between all the chipsets.

It's also required by common/block/lpc/lpc.c.

Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: I361dfabfe0c04667a2c112955133831a985d5cc0
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50509
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>

src/soc/amd/picasso/acpi.c

@@ -390,13 +390,6 @@ void generate_cpu_entries(const struct device *device)
 	acpigen_pop_len();
 }
 
-unsigned long southbridge_write_acpi_tables(const struct device *device,
-		unsigned long current,
-		struct acpi_rsdp *rsdp)
-{
-	return acpi_write_hpet(device, current, rsdp);
-}
-
 void soc_fill_gnvs(struct global_nvs *gnvs)
 {
 	/* Set unknown wake source */