Add pin controller support for Nuvoton NPCX series
Add pin-mux controller support for Nuvoton NPCX series.
This CL includes:
1. Add pin controller device tree declarations and introduce alt-cells
to select pads' functionality.
2. Add npcx7-alts-map.dtsi since the mapping between IO and controller
is irregular and vary in each chip series.
3. Add nuvoton,npcx-pinctrl-def.yaml and its declarations to change all
pads' functionality to GPIO by default.
4. Pinmux controller driver implementation.
Signed-off-by: Mulin Chao <MLChao@nuvoton.com>
Mulin Chao