component: draw the state machine flow chart

this flow chart diagram only cover the right flow.
if there is no event between two states, that means
you will hit the error flow during state transfer.

Signed-off-by: Wu Zhigang <zhigang.wu@linux.intel.com>

Author: Wu Zhigang

src/include/sof/audio/component.h

@@ -49,16 +49,31 @@
  *
  * States may transform as below:-
  *
- * 1) i.e. Initialisation to playback and pause/release
- * init --> setup --> prepare --> active <-> paused --+
- *                       ^                             |
- *                       +-----------------------------+
  *
- * 2) i.e. Suspend
+ *                            -------------
+ *                   pause    |           |    stop/xrun
+ *              +-------------| ACTIVITY  |---------------+
+ *              |             |           |               |      prepare
+ *              |             -------------               |   +-----------+
+ *              |                ^     ^                  |   |           |
+ *              |                |     |                  |   |           |
+ *              v                |     |                  v   |           |
+ *       -------------           |     |             -------------        |
+ *       |           |   release |     |   start     |           |        |
+ *       |   PAUSED  |-----------+     +-------------|  PREPARE  |<-------+
+ *       |           |                               |           |
+ *       -------------                               -------------
+ *              |                                      ^     ^
+ *              |               stop/xrun              |     |
+ *              +--------------------------------------+     |
+ *                                                           | prepare
+ *                            -------------                  |
+ *                            |           |                  |
+ *                ----------->|   READY   |------------------+
+ *                    reset   |           |
+ *                            -------------
+ *
  *
- * setup --> suspend --> setup OR
- * prepare --> suspend -> prepare OR
- * paused --> suspend --> paused
  */
 
 #define COMP_STATE_INIT		0	/* component being initialised */