rsc_table_tci66*: Fixed resource table to add carveout entry.

Previously, rsc_table_tci66*.h files were missing the line:

                        offsetof(struct resource_table, data_cout),

Also, a TRACE_ONLY version of rsc_table_tci6638.h was written for the
messageq_multicore.c example (no host, but loaded via remoteproc).

Signed-off-by: G Anthony <a0783926@ti.com>
tests: Built messageq_multicore test, for Kepler, without rpmsg HOST.

This is a standard test taken from the IPC 1.x tree for multicore devices.

It allows testing on Kepler, without involving Virtio devices.
It should be loaded from MPM loader or keystone_remoteproc, and does use the
trace buffer.

To build, subtitute the build files with their *.no_host_kepler named counter-
parts, and rebuild.

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