samples: enable multicore samples for MCXN947 board

This commit adds support for these multicore samples:
- samples/drivers/mbox
- samples/drivers/mbox_data
- samples/subsys/ipc/ipc_service/static_vrings
- samples/subsys/ipc/openamp

Signed-off-by: Tomas Galbicka <tomas.galbicka@nxp.com>