rename jtag_khz as adapter_khz

Globally rename "jtag_khz" as "adapter_khz", and move it out of the "jtag"
command group ...  it needs to be used with non-JTAG transports

Includes a migration aid (in jtag/startup.tcl) so that old user scripts
won't break.  That aid should Sunset in about a year.  (We may want to
update it to include a nag message too.)

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>

tcl/interface/oocdlink.cfg

@@ -8,5 +8,5 @@ interface ft2232
 ft2232_device_desc "OOCDLink"
 ft2232_layout oocdlink
 ft2232_vid_pid 0x0403 0xbaf8
-jtag_khz 5
+adapter_khz 5