MAINTAINERS: Add MG100 board to Laird Connectivity Platforms

Add the MG100 board as a Laird Connectivity platform

Signed-off-by: Ryan Erickson <[email protected]>

Author: rerickson1

MAINTAINERS.yml

@@ -1286,6 +1286,7 @@ Laird Connectivity platforms:
     - boards/arm/bt510/
     - boards/arm/bt610/
     - boards/arm/pinnacle_100_dvk/
+    - boards/arm/mg100/
   labels:
     - "platform: Laird Connectivity"