fwctl/bnxt_en: Move common definitions to include/linux/bnxt/

fwctl/bnxt_en: Move common definitions to include/linux/bnxt/

We have common definitions that are now going to be used
by more than one component outside of bnxt (bnxt_re and
fwctl)

Move bnxt_ulp.h to include/linux/bnxt/ as ulp.h.

Link: https://patch.msgid.link/r/20260314151605.932749-2-pavan.chebbi@broadcom.com
Reviewed-by: Andy Gospodarek <gospo@broadcom.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Cc: linux-rdma@vger.kernel.org
Signed-off-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>