Merge "Declare main in global NS, without extern "C"" into main am: 9995f07bc5 am: 9be9c396de

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/3448290

Change-Id: If7dd6cf234fbf50f8a7a6705a4e509d40ce5c9bd
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>