dt-bindings: Add doc for the Ingenic TCU drivers

Add documentation about how to properly use the Ingenic TCU
(Timer/Counter Unit) drivers from devicetree.

Signed-off-by: Paul Cercueil <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
Tested-by: Mathieu Malaterre <[email protected]>
Tested-by: Artur Rojek <[email protected]>
Signed-off-by: Paul Burton <[email protected]>
Cc: Ralf Baechle <[email protected]>
Cc: James Hogan <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Lee Jones <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Daniel Lezcano <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Michael Turquette <[email protected]>
Cc: Stephen Boyd <[email protected]>
Cc: Jason Cooper <[email protected]>
Cc: Marc Zyngier <[email protected]>
Cc: Rob Herring <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]

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