[RISCV][CodeGenPrepare] Remove duplicated transform for zext. NFC. (#72053)
After #71534 and #72052, the transform `zext -> zext nneg` in `RISCVCodeGenPrepare` is redundant.
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After #71534 and #72052, the transform `zext -> zext nneg` in `RISCVCodeGenPrepare` is redundant.