NFSv4 expose nfs_parse_server_name function

stable inclusion
from stable-v5.10.101
commit 6f2974b52b15a09cf3fbeb353ccdf2a2b737ca76
bugzilla: https://gitee.com/openeuler/kernel/issues/I5669Z

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=6f2974b52b15a09cf3fbeb353ccdf2a2b737ca76



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[ 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: Yu Liao <liaoyu15@huawei.com>
Reviewed-by: Wei Li <liwei391@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>