net/ice: export DDP definition symbols

net/ice: export DDP definition symbols

A new DCF PMD will be introduced, which runs on Intel VF hardware, and
it is a pure software design to control the advance functionality (such
as switch, ACL) for rest of the VFs.

The DCF (Device Config Function) feature shares the core functions of
the ICE PMD, like it needs to export the DDP definition symbols for the
new DCF PMD use.

Signed-off-by: Haiyue Wang <haiyue.wang@intel.com>
Acked-by: Xiaolong Ye <xiaolong.ye@intel.com>
Acked-by: Qi Zhang <qi.z.zhang@intel.com>