tcl/interface/jtag_vpi: Adapt to new jtag_vpi command syntax

Change-Id: I27eeab5e3dd554af00799104471ee8f30fbd0c51
Signed-off-by: Marc Schink <dev@zapb.de>
Reviewed-on: http://openocd.zylin.com/6399
Tested-by: jenkins
Reviewed-by: Jan Matyas <matyas@codasip.com>
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>

tcl/interface/jtag_vpi.cfg

@@ -14,5 +14,5 @@ if { [info exists VPI_ADDRESS] } {
    set _VPI_ADDRESS "127.0.0.1"
 }
 
-jtag_vpi_set_port $_VPI_PORT
-jtag_vpi_set_address $_VPI_ADDRESS
+jtag_vpi set_port $_VPI_PORT
+jtag_vpi set_address $_VPI_ADDRESS