Set the default number of RX and TX queues due to
the recent changes of stmmac driver.
Otherwise the ethernet will crash once it starts.
Signed-off-by: Kelvin Cheung <keguang.zhang@gmail.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/17452/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>