[RISCV][NFC] Remove unused methods of tuimm5 (#79680)

Since we only use tuimm5 in patterns, it doesn't need those methods for
MC layer. And there is not `getUImmOpValue` defination now, leave those
methods is confusing.

Author: jacquesguan

llvm/lib/Target/RISCV/RISCVInstrInfoZvk.td

@@ -15,17 +15,7 @@
 // Operand and SDNode transformation definitions.
 //===----------------------------------------------------------------------===//
 
-def tuimm5 : Operand<XLenVT>, TImmLeaf<XLenVT, [{return isUInt<5>(Imm);}]> {
-  let ParserMatchClass = UImmAsmOperand<5>;
-  let EncoderMethod = "getUImmOpValue";
-  let DecoderMethod = "decodeUImmOperand<5>";
-  let MCOperandPredicate = [{
-    int64_t UImm;
-    if (MCOp.evaluateAsConstantImm(UImm))
-      return isUInt<5>(UImm);
-    return MCOp.isBareSymbolRef();
-  }];
-}
+def tuimm5 : RISCVOp, TImmLeaf<XLenVT, [{return isUInt<5>(Imm);}]>;
 
 //===----------------------------------------------------------------------===//
 // Instruction class templates