RDMA: Add IB_UVERBS_CORE_SUPPORT_ROBUST_UDATA

This flag can be set by drivers once they have finished auditing and
implementing the full udata support on every udata operation.

My intention going forward is that driver authors proposing new udata uAPI
for their drivers must first do the work and set this flag.

If this flag is not set the userspace should not try to use udata based
uAPI newer than this commit, though on a case by case basis it may be OK
based on what checks historical kernels performed on the specific call.

Since bnxt_re is audited now, it is the first driver to set the flag.

Link: https://patch.msgid.link/r/13-v3-bd56dd443069+49-bnxt_re_uapi_jgg@nvidia.com
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

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