tcl/board: Add config for XMOS xCORE-XA Core Module ARM debugging

tcl/board: Add config for XMOS xCORE-XA Core Module ARM debugging

The xCORE-XA Core Module board has an XS1-XAU8A-10 SoC with 8 xCORE cores
and one ARM core. This config is for the ARM Cortex-M3, via J-Link OB.

Tested with "J-Link OB-STM32F103 V1 compiled Feb  5 2014 13:48:52".

Change-Id: Id7fadf8f323b45d5cfc0cae1054bd7b916771d6a
Signed-off-by: Andreas Färber <afaerber@suse.de>
Reviewed-on: http://openocd.zylin.com/2763
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>
Reviewed-by: Paul Fertser <fercerpav@gmail.com>