nfsd: allow deprecated interface to be compiled out.

Add CONFIG_NFSD_DEPRECATED, default to y.
Only include deprecated interface if this is defined.
This allows distros to remove this interface before the official
removal, and allows developers to test without it.

Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

diff --cc fs/Makefile
Simple merge

diff --cc fs/compat.c
Simple merge

diff --cc fs/nfsd/Kconfig
Simple merge

diff --cc fs/nfsd/export.c
Simple merge

diff --cc fs/nfsd/nfsctl.c
Simple merge