brcm47xx: fix USB driver choice for Asus WL-500W

brcm47xx: fix USB driver choice for Asus WL-500W

BCM4704 SoC has only USB 1.1 core:
ssb: Core 3 found: USB 1.1 Hostdev (cc 0x808, rev 0x03, vendor 0x4243)
but this device actually comes with two USB 2.0 ports.

It appears embedded controller isn't used but instead there are two PCI
attached controllers (next to the BCM4321 wireless card):
1106:3038 VT82xx/62xx UHCI USB 1.1 Controller
1106:3104 USB 2.0

Choose a set of USB drivers which actually support this hardware.

Signed-off-by: Mirko Parthey <mirko.parthey@web.de>
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>