Add a C6X-specific ipc.h.
Add a C6X-specific ipc.h.

Signed-off-by: Bernd Schmidt <c931ab6ac2d0c45d944fa77d0e13e53c91dbbf4d@codesourcery.com>

joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc