Support newer OSBDM firmware

OSBDM: add new VID:PID implemented in OSJTAG/OSBDM firmware somewhere
between versions 30.13 and 31.21.  PFLASH programming works with this
patch, tested on a Freescale Kinetis TWR-K20D72M using its onboard OSBDM
JTAG adapter.

Note: flash program testing required hacking kinetis_write() to force
longword programming, as the FTFL program section commands formulated by
kinetis_write() currently fail on this board's PK20DX256VLL7 processor.

Change-Id: Ib7b92ff2fe9ebf6158fb1489f554a19e96cd9651
Signed-off-by: R. Steve McKown <rsmckown@gmail.com>
Reviewed-on: http://openocd.zylin.com/1348
Tested-by: jenkins
Reviewed-by: Freddie Chopin <freddie.chopin@gmail.com>