Platform: Add support for BL5340 DVK

This adds supports for the Laird Connectivity BL5340 DVK (development kit)
application core, which is based on the nRF5340 SoC.

Signed-off-by: Jamie McCrae <jamie.mccrae@lairdconnect.com>
Change-Id: I062412918d4cbe692748c1a31fef444190f50661
41 files changed