samples: net: lwm2m_client: Add support for MG100 board

Add support to build sample for MG100 board.

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

Author: rerickson1

samples/net/lwm2m_client/sample.yaml

@@ -5,7 +5,7 @@ tests:
   sample.net.lwm2m_client:
     harness: net
     depends_on: netif
-    platform_allow: qemu_x86 frdm_k64f pinnacle_100_dvk
+    platform_allow: qemu_x86 frdm_k64f pinnacle_100_dvk mg100
     tags: net lwm2m
   sample.net.lwm2m_client.all_objects:
     harness: net
@@ -26,7 +26,7 @@ tests:
     harness: net
     depends_on: netif
     extra_args: OVERLAY_CONFIG=overlay-dtls.conf
-    platform_allow: qemu_x86 frdm_k64f pinnacle_100_dvk
+    platform_allow: qemu_x86 frdm_k64f pinnacle_100_dvk mg100
     tags: net lwm2m
   sample.net.lwm2m_client.bt:
     harness: net