Switch to using the internal HSI when a reset init is called, this also
matches the std stm32l cfg.
Read (verify) speed is increased from 17 to 120 KiB/s.
Change-Id: Ic94ba85949ffdefa17b7be45eef14e30f941d107
Signed-off-by: Spencer Oliver <spen@spen-soft.co.uk>
Reviewed-on: http://openocd.zylin.com/1004
Tested-by: jenkins
Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>