NFSD: Refactor nfsd_file_gc()

[ Upstream commit 3bc6d347 ]

Refactor nfsd_file_gc() to use the new list_lru helper.

Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>