The stm32 family supports using SYSRESETREQ as a software reset, lets
use it.
Change-Id: I171ffa8d888a2d0c28b266051030311521e9bca9
Signed-off-by: Spencer Oliver <spen@spen-soft.co.uk>
Reviewed-on: http://openocd.zylin.com/472
Tested-by: jenkins
Reviewed-by: Mathias Küster <kesmtp@freenet.de>