NFSv4 expose nfs_parse_server_name function

stable inclusion
from linux-4.19.230
commit 42dc3cf3174ec714732825638947e26923d9ea2a

--------------------------------

[ Upstream commit f5b27cc6 ]

Make nfs_parse_server_name available outside of nfs4namespace.c.

Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Yongqiang Liu <liuyongqiang13@huawei.com>
Signed-off-by: Laibin Qiu <qiulaibin@huawei.com>