dt-bindings: sifive: describe sifive-blocks versioning

For IP blocks that are generated from the public, open-source
sifive-blocks repository, describe the version numbering policy
that its maintain

dt-bindings: sifive: describe sifive-blocks versioning

For IP blocks that are generated from the public, open-source
sifive-blocks repository, describe the version numbering policy
that its maintainers intend to use, upon request from Rob
Herring <[email protected]>.

Signed-off-by: Paul Walmsley <[email protected]>
Signed-off-by: Paul Walmsley <[email protected]>
Reviewed-by: Palmer Dabbelt <[email protected]>
Cc: Rob Herring <[email protected]>
Cc: Palmer Dabbelt <[email protected]>
Cc: Megan Wachs <[email protected]>
Cc: Wesley Terpstra <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Rob Herring <[email protected]>

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