build_helper_config: Rename dma350_ns example

The dma350_ns example in the tf-m-extras repository was
renamed to clcd_example. Renamed the related configs here
to keep it in sync.

Change-Id: If1d7befdf074b7dc7b570c6d25e12bc35bb0e20f
Signed-off-by: Bence Balogh <bence.balogh@arm.com>
2 files changed