flash Kinetis: add KV5x family

Real time control MCU has a Cortex-M7 and numerous changes in flash layout.
Introduced a new ID of MDM-AP.

While on it a LOG_DEBUG format error fixed.

Change-Id: I1018660ce0c3dd63ac5e2563408fabff3c3daef7
Signed-off-by: Tomas Vanek <vanekt@fbl.cz>
Reviewed-on: http://openocd.zylin.com/3900


Tested-by: jenkins
Reviewed-by: Joakim Nohlgård <joakim.nohlgard@eistec.se>
Reviewed-by: Freddie Chopin <freddie.chopin@gmail.com>