SWDEV-364576 - initialize device malloc heap state using blit kernel

Change-Id: I5d0172aff7d2c04b322a4d828b8a2b438158b80f

rocclr/utils/flags.hpp

@@ -280,6 +280,8 @@ release(bool, HIP_USE_RUNTIME_UNBUNDLER, true,                                \
         "Force this to use Runtime code object unbundler.")                   \
 release(bool, HIPRTC_USE_RUNTIME_UNBUNDLER, false,                            \
         "Set this to true to force runtime unbundler in hiprtc.")             \
+release(size_t, HIP_INITIAL_DM_SIZE, 8 * Mi,                                  \
+        "Set initial heap size for device malloc.")                           \
 
 namespace amd {