adi_v5_dapdirect: add support for adapter drivers that provide DAP API

Some high level adapters, like STLINK-V3 and new firmware for
ST-Link/V2, provide API to directly access the DAP registers
hiding the details of the physical transport JTAG or SWD.
OpenOCD has already the intermediate API in struct dap_ops that
are suitable for such adapters, but are not exposed to the
adapter drivers.

Add in struct adapter_driver two independent struct dap_ops for
the cases of physical JTAG and SWD transport.
Add new transport names "dapdirect_jtag" and "dapdirect_swd", to
be used by the drivers that provide one or both DAP API.
Add the necessarily glue in target/adi_v5_dapdirect.c

Change-Id: I2bb8e3a80fba750f2c218d877cfa5888428e3c28
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: http://openocd.zylin.com/4903
Tested-by: jenkins
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>

src/jtag/interface.h

@@ -351,6 +351,12 @@ struct adapter_driver {
 
 	/** Low-level SWD APIs */
 	const struct swd_driver *swd_ops;
+
+	/* DAP APIs over JTAG transport */
+	const struct dap_ops *dap_jtag_ops;
+
+	/* DAP APIs over SWD transport */
+	const struct dap_ops *dap_swd_ops;
 };
 
 extern const char * const jtag_only[];