nvme-pci: allow use of cmb on v1.4 controllers

stable inclusion
from stable-5.10.14
commit 3e554aa3d08a1d319b60c8e8db31dcdd97f3b945
bugzilla: 48051

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

[ Upstream commit 20d3bb92 ]

Since NVMe v1.4 the Controller Memory Buffer must be explicitly enabled
by the host.

Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
[hch: avoid a local variable and add a comment]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>
Acked-by: Xie XiuQi <xiexiuqi@huawei.com>