ANDROID: fuse-bpf: Move bpf earlier in fuse_permission

In the backing case, we initially want to call out to the fuse-bpf
implementation, and only fall back to userspace if that requests it.
Otherwise we end up making requests to userspace that the daemon may not
be equiped to respond to.

Change-Id: If3780aa8b7c45558717a9efba0b1781e8d63a3c0
Bug: 217570523
Test: generic/099
Signed-off-by: Daniel Rosenberg <drosen@google.com>