Revert "Merge 751777a7 ("nfsd: make svc_stat per-network namespace instead...

Revert "Merge 751777a7 ("nfsd: make svc_stat per-network namespace instead of global") into android12-5.10-lts"

This reverts commit 44e9ffcf8f27f726358477ec3a99826d583922cc, reversing
changes made to b22678f8.

Merge "around" the nfsd changes that are in 5.10.226

Change-Id: If3a05a4f399bca9983f2ee2433ed44037e6d050b
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>