lantiq: cleanup dts files

lantiq: cleanup dts files

- remove not existing properties
- remove properties having the same values as the included dtsi
- remove nodes which are disabled in the included dtsi and not enabled
  in dts
- replace the deprecated pinctrl-* compatible strings
- use the same labels for nodes as the included dtsi
- move common used vr9 pci properties to vr9.dtsi
- remove the unused stp node from HomeHub 2B devcie tree source file
- fix spaces vs. tabs and remove superfluous linebreaks

Signed-off-by: Mathias Kresin <dev@kresin.me>