staging: vc04_services: Remove unused structs

Removes unused opaque struct typedefs. Issue found by checkpatch.
Signed-off-by: Jamal Shareef <jamal.k.shareef@gmail.com>
Link: https://lore.kernel.org/r/acc1e07a0b2c4e67ae417086087c9ce3d7f932f4.1572652827.git.jamal.k.shareef@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vc04_services/interface/vchi/vchi_common.h

@@ -112,12 +112,6 @@ struct vchi_msg_vector {
 	int32_t vec_len;
 };
 
-// Opaque type for a connection API
-typedef struct opaque_vchi_connection_api_t VCHI_CONNECTION_API_T;
-
-// Opaque type for a message driver
-typedef struct opaque_vchi_message_driver_t VCHI_MESSAGE_DRIVER_T;
-
 // Iterator structure for reading ahead through received message queue. Allocated by client,
 // initialised by vchi_msg_look_ahead. Fields are for internal VCHI use only.
 // Iterates over messages in queue at the instant of the call to vchi_msg_lookahead -