eal: make lcore config private

eal: make lcore config private

The internal structure of lcore_config does not need to be part of
visible API/ABI. Make it private to EAL.

Rearrange the structure so it takes less memory (and cache footprint).

Since we change the ABI, bump the library version.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David Marchand <david.marchand@redhat.com>
Acked-by: Thomas Monjalon <thomas@monjalon.net>
Acked-by: Anatoly Burakov <anatoly.burakov@intel.com>