Write newline to kmsg log

... to help flush the write. This doesn't fully fix b/306499233
but helps to ensure the VIRTUAL_DEVICE_DISPLAY_POWER_MODE_CHANGED
events show up.

Bug: b/306499233
Test: launch Cuttlefish, fold device in the WebRTC UI
Change-Id: Ia62a23ed0d53b8f9d3df4e3dc9a8063b4f520c66
1 file changed