Sync VAD and DMA examples source paths with tf-m

- The native drivers have been moved to a common
directory in the tf-m arm platform ports.
- The  tfm_ns_interface.c has been replaced with
tfm_ns_interface_rtos.c

Change-Id: If2cfbe5e818109b37c98e44204c2cc07b00b82fa
Signed-off-by: Bence Balogh <bence.balogh@arm.com>
3 files changed