MIPS: Lantiq: Activate more drivers in default configuration

MIPS: Lantiq: Activate more drivers in default configuration

This activates the following functionalities:
* SMP support (used on xRX200)
* PCI support
* NAND driver
* PHY driver
* UART
* Watchdog
* USB 2.0 controller

These driver are driving different IP cores found on the supported SoCs.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Acked-by: John Crispin <john@phrozen.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/14628/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>