dt: pinctrl: Document device tree binding

The core pin controller bindings define:
* The fact that pin controllers expose pin configurations as nodes in
  device tree.
* That the bindings for those pin configuration nodes is defined by the
  individual pin controller drivers.
* A standardized set of properties for client devices to define numbered
  or named pin configuration states, each referring to some number of the
  afore-mentioned pin configuration nodes.
* That the bindings for the client devices determines the set of numbered
  or named states that must exist.

Signed-off-by: Stephen Warren <[email protected]>
Acked-by: Shawn Guo <[email protected]>
Acked-by: Tony Lindgren <[email protected]>
Acked-by: Linus Walleij <[email protected]>
Acked-by: Simon Glass <[email protected]>
Acked-by: Dong Aisheng <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>

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