MIPS: ath79: Use the reset controller to restart OF machines

Don't set _machine_restart() on OF machines as the reset driver
now provides a system restart handler.

Signed-off-by: Alban Bedel <albeu@free.fr>
Cc: Felix Fietkau <nbd@openwrt.org>
Cc: Antony Pavlov <antonynpavlov@gmail.com>
Cc: Gabor Juhos <juhosg@openwrt.org>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/12235/


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