board: sifive: Add an interface to get PCB revision
There are different DDR parameter settings for different board revisions. Add a new interface to get the PCB revision to determine which DT should be selected at runtime. Signed-off-by: NZong Li <zong.li@sifive.com> Reviewed-by: NLeo Yu-Chi Liang <ycliang@andestech.com>
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