Cache FUSE VFS dentries

We already ensure that we invalidate FUSE VFS dentries when we modify
the corresponding file on the lower file system.

This allows us turn on caching and improve performance

Bug: 149512775
Test: atest FuseDaemonHostTest#testVfsCacheConsistency
Change-Id: I3f2f8e7a2009ec4e15d6771522813b6f06316298
Merged-In: I3f2f8e7a2009ec4e15d6771522813b6f06316298
(cherry picked from commit 435e9fdd3f10a751336ae03d73c679af2e1769db)
1 file changed