flash Kinetis: add KL28 device

This device differs a lot from others in KL series.

Unfortunately the System Integration Module, where device
identification resides, moved to a new address so probe now have
to try both addresses of SIM_SDID.

Introduce a new bank creation option: -sim-base to ensure error free probe.

WDOG32 is slightly different from KE1x and on different address.
System Mode Controler changed layout to word aligned.

Change-Id: I2c9dca0c4ad4228fcc941d6078d15f5e394833ff
Signed-off-by: Tomas Vanek <vanekt@fbl.cz>
Reviewed-on: http://openocd.zylin.com/4059


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