Smdk4412: Add ZSL overlay

Change-Id: I571101d3ecf8f991d97d96f3e5c2de6535c8d07b
Signed-off-by: Josue Rivera <prbassplayer@gmail.com>
(cherry picked from commit 599ba08b3a2e0a9e7d9701d89a307333472a8052)