Implement waiter.Waitable methods on VFS2 host inodes.
Implement waiter.Waitable methods on VFS2 host inodes.

This fixes bash in Ubuntu.

Updates #1672.

PiperOrigin-RevId: 309298252

google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor