Temporarily disable SDMA ganging by default

SDMA ganging is causing some regressions with some applications hanging.
Temporarily disabling SDMA ganging by default until issue is fixed.

Change-Id: I65e172923a53a967df27b30d969ad5d215c4fa09


[ROCm/ROCR-Runtime commit: a20a0a5bac]

projects/rocr-runtime/runtime/hsa-runtime/core/runtime/amd_gpu_agent.cpp

@@ -885,7 +885,7 @@ hsa_status_t GpuAgent::DmaCopy(void* dst, core::Agent& dst_agent,
     Flag::SDMA_OVERRIDE sdma_override =
         core::Runtime::runtime_singleton_->flag().enable_sdma();
     // Blit copies already saturate xGMI
-    if (sdma_override == Flag::SDMA_DISABLE || sdma_gang_override == Flag::SDMA_DISABLE) {
+    if (sdma_override == Flag::SDMA_DISABLE || sdma_gang_override != Flag::SDMA_ENABLE) {
       break;
     }