Merge tag 'meson8-dt-fix' of https://github.com/carlocaione/linux-meson into fixes

With http://www.spinics.net/lists/devicetree/msg116771.html we split / refactor
the pinctrl driver to have two different pinctrl devices for each bus on the
Amlogic Meson8 / Meson8b SoCs.
These are the missing patches for documentation and DT that weren't pulled into
mainline with the driver changes.

* tag 'meson8-dt-fix' of https://github.com/carlocaione/linux-meson:
  documentation: Fix pinctrl documentation for Meson8 / Meson8b
  ARM: dts: amlogic: Split pinctrl device for Meson8 / Meson8b