lantiq: xway: add support for AVM FRITZ!Box 7330

lantiq: xway: add support for AVM FRITZ!Box 7330

The AVM FRITZ!Box 7330 shares hardware with the AVM Fritzbox 7320
except for the second ethernet port, which only supports 100M.

Hardware:
- SoC: Lantiq ARX 188
- CPU: 2x MIPS 34Kc 393 MHz
- RAM: 64 MiB 196 MHz
- Flash: 16 MiB NAND
- Ethernet: Built-in Gigabit Ethernet switch, 1x 1GbE, 1x 100M
- Wifi: Atheros AR9227-BC2A b/g/n with 2 pcb/internal antennas
- USB: 2x USB 2.0
- DSL: Built-in ADSL2+ modem
- DECT: Dialog SC14441
- LEDs: 1 two-color, 4 one-color
- Buttons: 1x DECT, 1x WIFI
- Telephone connectors: 1 FXS port via TAE or RJ11 connector

Installation:
The installation process is described on the wiki.

Unsupported (same as AVM 7320):
- VoIP (DECT and FXS),
- Second Ethernet port.

Signed-off-by: Aleksander Jan Bajkowski <olek2@wp.pl>