Adds support for LynuxWorks Kernel Downloadable Images (KDIs).
Both LynxOS and BlueCat linux KDIs are supported.

Currently supports only the MPC8260 (as I am unable to test on
other CPUs/Targets). Tested using MPC8260ADS, BlueCat 3.0,
and LynxOS 4.0.

The type of KDI (e.g. LynxOS or BlueCat) is auto-detected.
As such mkimage must specify os type "lynxos".
See doc/README.lynxkdi for more details.

Regards,
--Scott

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