Revert "ANDROID: fuse-bpf: use target instead of parent inode

to execute backing revalidate"

This reverts commit b610eff2.

Reason for revert: I broke BPF calling logic with this one. Possible
fix is here:
https://android-review.googlesource.com/c/kernel/common/+/2132134

 but
we're still discussing possible way to go there:
go/fuse-bpf-revalidate-problem
Change-Id: I517941a2c341999dc8133b93cf045ec67bcf8a9e
Signed-off-by: Dmitrii Merkurev <dimorinny@google.com>