mainboard/hp/dl145_g3/get_bus_conf.c: Use ARRAY_SIZE macro

Change-Id: Ie3287cba45bd6f4f8823ce03cd9983707c9ad0de
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/6194
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
Tested-by: build bot (Jenkins)
1 file changed