DEVICETREE: Add Ingenic CGU binding documentation

Document the devicetree binding for Ingenic SoC CGUs, and add headers
defining the clock specifiers for clocks provided by the JZ4740 & JZ4780
CGU blocks.

Signed-off-by: Paul Burton <[email protected]>
Cc: Ian Campbell <[email protected]>
Cc: Kumar Gala <[email protected]>
Cc: Lars-Peter Clausen <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Mike Turquette <[email protected]>
Cc: Pawel Moll <[email protected]>
Cc: Rob Herring <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Patchwork: https://patchwork.linux-mips.org/patch/10152/
Signed-off-by: Ralf Baechle <[email protected]>

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