Add support to retrieve process SDMA usage information.

Also, print SDMA usage information in TestProcInfoRead.

Change-Id: I8d19be3b8653e298c81237e5067eca75a1743e70

include/rocm_smi/rocm_smi.h

@@ -748,6 +748,7 @@ typedef struct {
     uint32_t process_id;  //!< Process ID
     uint32_t pasid;    //!< PASID
     uint64_t vram_usage;  //!< VRAM usage
+    uint64_t sdma_usage;  //!< SDMA usage in microseconds
 } rsmi_process_info_t;