This is supposed to replace big part of armv7m_trace.[ch], since TPIU is not only the one implemented in Cortex-M3 and M4. Change-Id: I7588d16cbefe9cdb371c52fb0aa5cdfb48518804 Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com> Reviewed-on: http://openocd.zylin.com/5858 Tested-by: jenkins