The smallest pert in the family has 10k RAM, so use that as a default
for the working area.
Change-Id: I78be0d14a254c109ac15a7163552c6132f810416
Signed-off-by: Spencer Oliver <spen@spen-soft.co.uk>
Reviewed-on: http://openocd.zylin.com/1005
Tested-by: jenkins
Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>