ANDROID: GKI: add debugfs_lookup_and_remove to virtual_device symbol list.

In commit bd75eba8 ("Bluetooth: vhci: Prevent use-after-free by
removing debugfs files early"), debugfs_lookup_and_remove() is now
called to fix up a memory leak.  Add this symbol to the virtual_device
build target so that it can continue to build properly

Fixes: bd75eba8 ("Bluetooth: vhci: Prevent use-after-free by removing debugfs files early")
Change-Id: I26e53a6d29e2b4d6a66b9bb3e90121af27079a22
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>