nfsd: Avoid relocking vnode for NFSv4 Readdir

Without this patch, nfsv4_fillattr() relocks the vnode to
test to see if extended attributes are supported.
This is inefficient and could cause deadlocks if Readdir
ever asks for this attribute.

At this time, no extant NFSv4 client asks for this attribute
for Readdir, but this patch fixes the problem in case a
future client does so, by moving the test for extended attribute
support to before the nfsv4_fillattr() call where the vnode
is still locked.

(cherry picked from commit c00baac0ab46f54951a29b834e064935b749ae9a)