net/mlx5: Expand mkey page size to support 6 bits

Protect the usage of the 6th bit with the relevant capability to ensure
we are using the new page sizes with FW that supports the bit extension.

Signed-off-by: Michael Guralnik <michaelgur@nvidia.com>
Link: https://patch.msgid.link/20240909100504.29797-2-michaelgur@nvidia.com


Signed-off-by: Leon Romanovsky <leon@kernel.org>