Add support for exporting portable handles to GPU allocations.

Adds hsa_amd_portable_export_dmabuf and hsa_amd_portable_close_dmabuf
which allow obtaining dmabuf handles to rocr allocations.  These handles
may be shared with other APIs to support cross vendor & cross device
memory sharing.
Adds query to return whether dmabuf export is supported

Signed-off-by: Jonathan Kim <Jonathan.Kim@amd.com>
Signed-off-by: David Yat Sin <David.YatSin@amd.com>

Change-Id: I7f98501087d9563d07fc2cb428cc886b1e518b1e


[ROCm/ROCR-Runtime commit: 42243c1e8f]

projects/rocr-runtime/runtime/hsa-runtime/inc/hsa_api_trace.h

@@ -192,6 +192,8 @@ struct AmdExtTable {
   decltype(hsa_amd_spm_release)* hsa_amd_spm_release_fn;
   decltype(hsa_amd_spm_set_dest_buffer)* hsa_amd_spm_set_dest_buffer_fn;
   decltype(hsa_amd_queue_cu_get_mask)* hsa_amd_queue_cu_get_mask_fn;
+  decltype(hsa_amd_portable_export_dmabuf)* hsa_amd_portable_export_dmabuf_fn;
+  decltype(hsa_amd_portable_close_dmabuf)* hsa_amd_portable_close_dmabuf_fn;
 };
 
 // Table to export HSA Core Runtime Apis