cfg: Deleted duplicate busblaster.cfg and renamed original.

cfg: Deleted duplicate busblaster.cfg and renamed original.

The busblaster.cfg was contributed on April 23, 2012 and is a
duplicate of dp_busblaster.cfg that was contributed on Oct. 23,
2011.  Therefore, deleting the second version.  Also, renaming
the original dp_busblaster.cfg to simply busblaster.cfg, as this
name is more concise.

Change-Id: Iccb1f10f53dbbb248b1ff4c6295eaf67c32247c1
Signed-off-by: Bill Traynor <wmat@alphatroop.com>
Reviewed-on: http://openocd.zylin.com/622
Tested-by: jenkins
Reviewed-by: Peter Stuge <peter@stuge.se>