Disable SDMA HDP flush on gfx10

Not currently functional, triggering SRBM write protection.

Change-Id: Ib0b832357e3df5a6a0d0b46648515ec9bd70f017

runtime/hsa-runtime/core/runtime/amd_blit_sdma.cpp

@@ -142,7 +142,8 @@ hsa_status_t BlitSdma<RingIndexTy, HwIndexMonotonic, SizeToCountOffset>::Initial
   }
 
   // HDP flush supported on gfx900 and forward.
-  if (agent_->isa()->GetMajorVersion() > 8) {
+  // FIXME: Not working on gfx10, raises SRBM write protection interrupt.
+  if (agent_->isa()->GetMajorVersion() == 9) {
     hdp_flush_support_ = true;
   }