Revert "Enable Ll128 on gfx90a (#823)" (#829)

This reverts commit d80fba94e9.

Also increase number of parallel jobs for linking

[ROCm/rccl commit: 3db371c9a5]

projects/rccl/src/graph/tuning.cc

@@ -451,9 +451,13 @@ ncclResult_t ncclTopoTuneModel(struct ncclComm* comm, int minCompCap, int maxCom
     int pEnable = protoEnable[p];
     if (pEnable == 2 && p == NCCL_PROTO_LL128) {
 #if defined(__HIP_PLATFORM_HCC__) || defined(__HCC__) || defined(__HIPCC__)
+#if defined(ENABLE_LL128)
       // Enable LL128 by default only on gfx90a with available tuning table
       pEnable = (graphs[a]->typeInter <= PATH_PXB) && graphs[a]->typeIntra <= PATH_NVL &&
         (comm->topo->nodes[GPU].nodes[0].gpu.gcn == 910 && comm->topo->ll128Enabled) ? 1 : 0;
+#else
+      pEnable = 0;
+#endif
 #else
       // Enable LL128 by default only on Volta/Ampere/Hopper+NVLink. Other cases are not tested and may cause silent data corruption.
       pEnable = 1;