lantiq: dts: use generic node names

lantiq: dts: use generic node names

In DTS Checklist[1] we're now demanding proper generic node names, as
the name of a node should reflect the function of the device and use
generic name for that[2]. Everybody seems to be copy&pasting from DTS
files available in the repository today, so let's unify that naming
there as well and provide proper examples.

1. https://openwrt.org/submitting-patches#dts_checklist
2. https://github.com/devicetree-org/devicetree-specification/blob/master/source/devicetree-basics.rst#generic-names-recommendation

Signed-off-by: Petr Štetiar <ynezz@true.cz>
[split out treewide patch, integrated P2812HNUF1 rename patch]
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
[merged key and led changes, use generic node name for flash, wifi and
gpio]
Signed-off-by: Mathias Kresin <dev@kresin.me>