Merge "Document return value of AServiceManager_openDeclaredPassthroughHal" into main am: ddf0e82e3a

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/2969432

Change-Id: I7f48c914c2a194bd173b702fe4d43a4dbadd29cc
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>