drivers/xlnx-pcie-xvc: Group adapter commands

Use a command group 'xlnx_pcie_xvc' with subcommands instead of individual
commands with 'xlnx_pcie_xvc_' prefix.

The old commands are still available for backward compatibility but
marked as deprecated.

Change-Id: I0deaaa14ed14f65bf356f3c248331bfab472f08d
Signed-off-by: Marc Schink <dev@zapb.de>
Reviewed-on: http://openocd.zylin.com/6391
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>

src/jtag/startup.tcl

@@ -315,4 +315,11 @@ proc presto_serial args {
 	eval presto serial $args
 }
 
+lappend _telnet_autocomplete_skip xlnx_pcie_xvc_config
+proc xlnx_pcie_xvc_config args {
+	echo "DEPRECATED! use 'xlnx_pcie_xvc config' not 'xlnx_pcie_xvc_config'"
+	eval xlnx_pcie_xvc config $args
+}
+
+
 # END MIGRATION AIDS