TCI6638:  Built messageq_single and messageq_multi for simKepler platform.

Added a custom simKepler platform to work around limitation in IPC Settings.xs
which prevented building a MultiProc configuration including "HOST".

Added a tci6638 family directory for Kepler specific stuff (if needed).

Build is defaulted for Kepler for GermanTown testing on VDB/EVM.

Appleton still builds and works, but need to uncomment in config.bld.

Both Appleton and Kepler will not build simultaneously in this tree (yet).

Signed-off-by: G Anthony <a0783926@ti.com>
Whitespace:  Tabs to space conversion, TISB .git hooks was complaining.

Signed-off-by: G Anthony <a0783926@ti.com>