AGESA: Call get_bus_conf() just once

Instead of calling get_bus_conf() three times from write_tables()
and executing it once, just make one call before entering write_tables().

Change-Id: I818e37128cb0fb5eaded3c1e00b6b146c1267647
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/6133
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>

src/mainboard/amd/thatcher/acpi_tables.c

@@ -134,8 +134,6 @@ unsigned long write_acpi_tables(unsigned long start)
 	acpi_header_t *ivrs;
 	acpi_hest_t *hest;
 
-	get_bus_conf(); /* it will get sblk, pci1234, hcdn, and sbdn */
-
 	/* Align ACPI tables to 16 bytes */
 	start = ALIGN(start, 16);
 	current = start;