transport: add transport_is_hla()

and move declaration of all transport_is_xxx() functions to transport.h

Change-Id: Ib229115b5017507b49655bc43b517ab6fb32f7a6
Signed-off-by: Tomas Vanek <vanekt@fbl.cz>
Reviewed-on: http://openocd.zylin.com/4469
Tested-by: jenkins
Reviewed-by: Matthias Welwarsky <matthias@welwarsky.de>

src/jtag/swd.h

@@ -211,6 +211,4 @@ struct swd_driver {
 int swd_init_reset(struct command_context *cmd_ctx);
 void swd_add_reset(int req_srst);
 
-bool transport_is_swd(void);
-
 #endif /* OPENOCD_JTAG_SWD_H */