Add IMX IPM sample application. It reads the data sent to the
Messaging Unit and sends them back. It has been tested on Udoo Neo Full
board with the Cortex-A9 core running Linux and sending the data
into the Messaging Unit A and the Cortex-M4 running this sample Zephyr
application and reading the data from Messaging Unit B and sending it
back for Linux side to read it from Messaging Unit A.
Origin: Original
Signed-off-by: Stanislav Poboril <stanislav.poboril@nxp.com>