MIPS: Document Pistachio boot protocol and device-tree bindings

The Pistachio SoC boots only with device-tree.  Document the required
properties and nodes as well as the boot protocol between the bootlaoder
and the kernel.

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: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: Andrew Bresticker <[email protected]>
Cc: Ezequiel Garcia <[email protected]>
Cc: James Hartley <[email protected]>
Cc: James Hogan <[email protected]>
Patchwork: https://patchwork.linux-mips.org/patch/9568/
Signed-off-by: Ralf Baechle <[email protected]>

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