IB/uverbs: Enable CQ ioctl commands by default

Enable CQ ioctl commands by default, this functionality is fully mature
to be used over ioctl, no reason to maintain any more the EXP KCONFIG
entry to enable it.

Link: https://lore.kernel.org/r/20200630093916.332097-2-leon@kernel.org
Signed-off-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>