Reset GPU_FORCE_BLIT_COPY_SIZE as its fixed in KFD

Commit ebcfa85cf7ebb26c96fca48a34292d88e74dd675
fixes programming of SDMA*_ULV_CNTL.HYSTERIS register

Change-Id: Ibb1d824bf3f8e351f840adbc099601b322f935f6

rocclr/device/device.cpp

@@ -483,9 +483,6 @@ Settings::Settings() : value_(0) {
       GPU_SINGLE_ALLOC_PERCENT = 100;
     }
 
-    if (flagIsDefault(GPU_FORCE_BLIT_COPY_SIZE)) {
-      GPU_FORCE_BLIT_COPY_SIZE = 1024;
-    }
   }
 }