NFS: Get rid of some obsolete macros

- NFS_READTIME, NFS_CHANGE_ATTR are completely unused.
- Inline the few remaining uses of NFS_ATTRTIMEO, and remove.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 9d012a6..4693879 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -117,8 +117,8 @@
 
 	nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
 
-	NFS_ATTRTIMEO(inode) = NFS_MINATTRTIMEO(inode);
-	NFS_ATTRTIMEO_UPDATE(inode) = jiffies;
+	nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
+	nfsi->attrtimeo_timestamp = jiffies;
 
 	memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode)));
 	if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))