ActivityManager: Update timeline debug statements

Update the timeline debug messages so that
'ActivityManager' is not used as the tag in log
messages as it interferes with some CTS tests.
CRs-fixed: 628703

Change-Id: I18c04eb47263246b6cf293210ba603127be99bd9
frameworks: add SmartCover stubs

Change-Id: Ibde77eb23b604afb20b54642113fcdae9c87fd1b
Signed-off-by: Roman Birg <roman@cyngn.com>