configs: arndale: Use appropriate driver for Asix AX88760

Arndale board has an Asix AX88760 USB 2.0 Hub and Fast Ethernet combo.
The appropriate driver for it is USB_ETHER_ASIX.

The mistake probably came from misinterpretation of commit e9954b86
("usb: eth: add ASIX AX88179 DRIVER") which was tested on RECS5250 COM
module.  This module indeed has Exynos5250 and some similarities with
Arndale 5250 board but the USB/Ethernet chip used there is apparently
different.

Fixes: f58ad98a ("usb: net: migrate USB Ethernet adapters to Kconfig")
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Lukasz Majewski <lukma@denx.de>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>