MIPS: ralink: Put the pci bus into reset state before rebooting the SoC

Some pcie cards have problems after a reboot without this.

Signed-off-by: John Crispin <blogic@openwrt.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/11446/


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