dt-bindings: Create DT bindings for SATA controllers

I need to create subnodes for drives connected to SATA
host controllers, and this needs to be supported
generally, so create a common YAML binding for
"sata" that will support subnodes with ports.

This has been designed as a subset of
ata/ahci-platform.txt with the bare essentials and
should be possible to extend or superset to cover the
common bindings.

Cc: Rob Herring <[email protected]>
Cc: [email protected]
Cc: Sergei Shtylyov <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>
[robh: fixup sata-port unit-address pattern]
Signed-off-by: Rob Herring <[email protected]>

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