[AMDGPU] Select no-return DS_PK_ADD_F16 in tblgen

[arsenm]

LGTM. Is this missing code removal for the manual selection?

llvm/lib/Target/AMDGPU/DSInstructions.td

 defm : DSAtomicCmpXChgSwapped_mc<DS_CMPST_RTN_B64, DS_CMPST_B64, i64, "atomic_cmp_swap">;
 
 let SubtargetPredicate = isGFX90APlus in {
 def : DSAtomicRetPat<DS_ADD_RTN_F64, f64, atomic_load_fadd_local_ret_64>;
 def : DSAtomicRetPat<DS_ADD_F64, f64, atomic_load_fadd_local_noret_64>;
 }
 
 let SubtargetPredicate = isGFX940Plus in {
-def : DSAtomicRetPat<DS_PK_ADD_RTN_F16, v2f16, atomic_load_fadd_v2f16_local_32>;
+def : DSAtomicRetPat<DS_PK_ADD_RTN_F16, v2f16, atomic_load_fadd_v2f16_local_ret_32>;
+def : DSAtomicRetPat<DS_PK_ADD_F16, v2f16, atomic_load_fadd_v2f16_local_noret_32>;
 def : GCNPat <
   (v2i16 (int_amdgcn_ds_fadd_v2bf16_ret i32:$ptr, v2i16:$src)),
   (DS_PK_ADD_RTN_BF16 VGPR_32:$ptr, VGPR_32:$src, 0, 0)
 >;
 def : GCNPat <
   (v2i16 (int_amdgcn_ds_fadd_v2bf16_noret i32:$ptr, v2i16:$src)),
   (DS_PK_ADD_BF16 VGPR_32:$ptr, VGPR_32:$src, 0, 0)
 >;