Blackfin: jtagconsole: disable output processing

Avoid extra carriage returns in the output by disabling output processing.
Otherwise, whenever the remote sends a \r\n, we end up with \r\r\n.

Reported-by: Vivi Li <vivi.li@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

Blackfin: add jtagconsole helper script

This script is similar to the netconsole script, but instead works with
the JTAG console device driver that exists on Blackfin parts.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>