phy: Add binding document for Pistachio USB2.0 PHY

Add a binding document for the USB2.0 PHY found on the IMG Pistachio SoC.

Signed-off-by: Andrew Bresticker <[email protected]>
Cc: Rob Herring <[email protected]>
Cc: Pawel Moll <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Ian Campbell <[email protected]>
Cc: Kumar Gala <[email protected]>
Cc: Kishon Vijay Abraham I <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: James Hartley <[email protected]>
Cc: Damien Horsley <[email protected]>
Patchwork: https://patchwork.linux-mips.org/patch/9727/
Signed-off-by: Ralf Baechle <[email protected]>

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