This applies some minor DTS style improvements to the files kept
in OpenWrt at the moment:
- harmonize/improve LED/pinmux node names
- harmonize empty lines between nodes
- change "ok" to "okay"
- some other minor formatting adjustments
Since changes are only cosmetical, they are only applied to the
"newer" DTS files for kernel 4.19.
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>