DM: ioc code cleanup

- make ioc_init/ioc_deinit take struct vmctx as argument
- ioc_init return int instead of pointer to struct ioc_dev
- add ioc_dev in vmctx to track ioc_dev
- remove the atkbdc.h included in vmmapi.h

Signed-off-by: Yin Fengwei <fengwei.yin@intel.com>
Reviewed-by: Liu, Yuan1 <yuan1.liu@intel.com>
Reviewed-by: Jason Chen CJ <jason.cj.chen@intel.com>
Reviewed-by: Wang Yu <yu1.wang@intel.com>
Acked-by: Anthony Xu <anthony.xu@intel.com>
Acked-by: Eddie Dong <Eddie.dong@intel.com>

devicemodel/include/vmmapi.h

@@ -62,6 +62,7 @@ struct vmctx {
 	/* fields to track virtual devices */
 	void *atkbdc_base;
 	void *vrtc;
+	void *ioc_dev;
 };
 
 /*