[RISCV][NFC] Remove redundant defvar in SiFive7 SchedModel (#181218) The defvar `SiFive7VA` inside `SiFive7SchedResources` is never used. More surprisingly, `NAME # SiFive7VA` -- the record it's supposed to point at -- is not even _defined_ when there are two VALUs (i.e. `dualVALU` is true). But I guess since that defvar is never used, TableGen parser simply ignores it and thus we never saw any error message. NFC.
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