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/cpu/amd/agesa/amd_late_init.c

@@ -36,6 +36,9 @@ static void agesawrapper_post_device(void *unused)
 		printk(BIOS_DEBUG, "agesawrapper_amdinitlate failed: %x \n", status);
 	}
 
+	/* Preparation for write_tables(). */
+	get_bus_conf();
+
 	if (!acpi_s3_resume_allowed())
 		return;