Revert "nfs: ignore SB_RDONLY when mounting nfs"

Revert "nfs: ignore SB_RDONLY when mounting nfs"

[ Upstream commit d4a26d34f1946142f9d32e540490e4926ae9a46b ]

This reverts commit 52cb7f8f177878b4f22397b9c4d2c8f743766be3.

Silently ignoring the "ro" and "rw" mount options causes user confusion,
and regressions.

Reported-by: Alkis Georgopoulos<alkisg@gmail.com>
Cc: Li Lingfeng <lilingfeng3@huawei.com>
Fixes: 52cb7f8f1778 ("nfs: ignore SB_RDONLY when mounting nfs")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>