Revert "Merge ccd9fe71 ("nfsd: Fix a regression in nfsd_setattr()") into android13-5.15-lts"

This reverts commit f1bd9b06, reversing
changes made to 88e96b82.

All of the NFS/fs core changes break the Android ABI in horrible ways.
NFS is not a supported filesystem on Android, so it is safe to revert
all of these.

Bug: 161946584
Change-Id: If9fa872e609d8cdc87717face81c0e7e6522823a
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>