[AMDGPU] NFC: Remove duplicate VOP_DPP_Pseudo TableGen definitions (#95370)

After recent changes, VOP_DPP_Pseudo now inherits from VOP_Pseudo.
This commit removes some on the duplicate definitions in
VOP_DPP_Pseudo that are exactly the same as definitions inherited from
VOP_Pseudo.

Author: ScottEgerton

llvm/lib/Target/AMDGPU/VOPInstructions.td

@@ -831,13 +831,9 @@ class VOP_DPP_Pseudo <string OpName, VOPProfile P, list<dag> pattern=[],
   dag Ins = P.InsDPP, string asmOps = P.AsmDPP> :
   VOP_Pseudo<OpName, "_dpp", P, P.OutsDPP, Ins, asmOps, pattern> {
 
-  let isPseudo = 1;
-  let isCodeGenOnly = 1;
-
   let mayLoad = 0;
   let mayStore = 0;
   let hasSideEffects = 0;
-  let UseNamedOperandTable = 1;
 
   let VALU = 1;
   let DPP = 1;
@@ -850,7 +846,6 @@ class VOP_DPP_Pseudo <string OpName, VOPProfile P, list<dag> pattern=[],
   let Uses = !if(ReadsModeReg, [MODE, EXEC], [EXEC]);
   let isConvergent = 1;
 
-  string Mnemonic = OpName;
   string AsmOperands = asmOps;
 
   let AsmMatchConverter = !if(P.HasModifiers, "cvtDPP", "");
@@ -863,8 +858,6 @@ class VOP_DPP_Pseudo <string OpName, VOPProfile P, list<dag> pattern=[],
 
   let IsInvalidSingleUseConsumer = !not(VINTERP);
   let IsInvalidSingleUseProducer = !not(VINTERP);
-
-  VOPProfile Pfl = P;
 }
 
 class VOP3_DPP_Pseudo <string OpName, VOPProfile P> :