SWDEV-475255 - MM Engine Decoding Throughput

Implemented DEC activity for now due to ENC activity is unavailable in
amdsmi.

Signed-off-by: Li Ma <li.ma@amd.com>
Change-Id: I34bb56e6e0d8d2ab91243f8932f0ac10cb2d1e9f

include/rdc/rdc.h

@@ -185,6 +185,8 @@ typedef enum {
   RDC_FI_GPU_UTIL = 500,    //!< GPU Utilization
   RDC_FI_GPU_MEMORY_USAGE,  //!< Memory usage of the GPU instance
   RDC_FI_GPU_MEMORY_TOTAL,  //!< Total memory of the GPU instance
+  RDC_FI_GPU_MM_ENC_UTIL,  //!< Multimedia encoder busy percentage
+  RDC_FI_GPU_MM_DEC_UTIL,  //!< Multimedia decoder busy percentage
 
   /**
    * @brief ECC related fields