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

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

Change-Id: I2bb57f6ff05282c473f848211768ac5fa5053ea2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>