MIPS: ralink: Remove check for CONFIG_PCI on non-PCI SoCs

The code currently panics if PCI is enabled but the SoC has no PCI bus.
This check is superfluous as the driver only loads if enabled in the
devicetree.

Signed-off-by: John Crispin <blogic@openwrt.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/11444/


Signed-off-by: Ralf Baechle <ralf@linux-mips.org>