ANDROID: fsnotify: Notify lower fs of open

If the filesystem being watched supports d_canonical_path,
notify the lower filesystem of the open as well.

Fixes: f37e0504 ("ANDROID: vfs: d_canonical_path for stacked FS")
Test: atest CtsOsTestCases:android.os.cts.FileObserverTest
Bug: 70706497
Signed-off-by: Daniel Rosenberg <drosen@google.com>
Signed-off-by: Paul Lawrence <paullawrence@google.com>
Signed-off-by: Alessio Balsini <balsini@google.com>
Change-Id: I7c9d210e8e6ee99928ad9db0b41ffc3ac3371dc0