nvme: refresh multipath head zoned limits from path limits

queue_limits_stack_bdev() updates the multipath head limits from the
path queue, but it does not propagate max_open_zones or
max_active_zones. As a result, a zoned multipath namespace head can
keep stale 0/0 values even after a ready path reports finite zoned
resource limits.

When refreshing the head limits in nvme_update_ns_info(), stack the
zoned resource limits directly after stacking the path queue limits.
Use min_not_zero() so the block layer's 0 value keeps its "no limit"
meaning while finite limits are combined conservatively.

This avoids advertising "no limit" on the multipath head while keeping
the zoned-limit handling local to the NVMe multipath update path.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Yao Sang <sangyao@kylinos.cn>
Signed-off-by: Keith Busch <kbusch@kernel.org>

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