pinctrl/lantiq: update devicetree binding in dts file

This patch updates the compatible string in the easy50712.dts file to the new
"lantiq,danube-pinctrl".

Signed-off-by: Martin Schiller <mschiller@tdt.de>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Cc: robh+dt@kernel.org
Cc: pawel.moll@arm.com
Cc: mark.rutland@arm.com
Cc: ijc+devicetree@hellion.org.uk
Cc: galak@codeaurora.org
Cc: john@phrozen.org
Cc: hauke@hauke-m.de
Cc: jogo@openwrt.org
Cc: daniel.schwierzeck@gmail.com
Cc: linux-gpio@vger.kernel.org
Cc: devicetree@vger.kernel.org
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/11589/


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