Restore some additional code acidentally removed from flash_kl28z.py
Restore some additional code acidentally removed from flash_kl28z.py

wjzhang/pyOCD,flit/pyOCD,flit/pyOCD,0xc0170/pyOCD,wjzhang/pyOCD,pyocd/pyOCD,matthewelse/pyOCD,matthewelse/pyOCD,matthewelse/pyOCD,0xc0170/pyOCD,mbedmicro/pyOCD,pyocd/pyOCD,0xc0170/pyOCD,mesheven/pyOCD,mbedmicro/pyOCD,mesheven/pyOCD,mbedmicro/pyOCD,wjzhang/pyOCD,mesheven/pyOCD