configure: Remove conflicting CMSIS_DAP conditional

It's already defined by PROCESS_ADAPTERS.

Change-Id: I3bbcb0f77c645e9c5a98c2d5069c178358d1516b
Signed-off-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>
Reviewed-on: http://openocd.zylin.com/3239


Tested-by: jenkins
Reviewed-by: Paul Fertser <fercerpav@gmail.com>