This adds support for the Blinkinlabs JTAG Hat, a Raspberry Pi
expansion board that provides JTAG and SWD connections via level-
shifting buffers.
Change-Id: I228bf6a18890b7c3d6679bbc63bfe39f726d8323
Signed-off-by: Matthew Mets <matt@blinkinlabs.com>
Reviewed-on: http://openocd.zylin.com/6372
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
Tested-by: jenkins