bl: app_is_valid takes app-location/size as params
bl: app_is_valid takes app-location/size as params

mrquincle/nRF51-ble-bcast-mesh,mrquincle/nRF51-ble-bcast-mesh,mrquincle/nRF51-ble-bcast-mesh,mrquincle/nRF51-ble-bcast-mesh