dt-bindings: riscv: Update YAML doc to support SiFive HiFive Unmatched board

Add new compatible strings to the YAML DT binding document to support
SiFive's HiFive Unmatched board

Signed-off-by: Yash Shah <yash.shah@sifive.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
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Yash Shah 2020-12-08 10:25:40 +05:30 • committed by Palmer Dabbelt
commit 3489c03010
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