net/i40e/base: fix reading LLDP configuration

net/i40e/base: fix reading LLDP configuration

Previous method for reading LLDP config was based on hard-coded offsets.
It happened to work, because of structured architecture of the NVM memory.
In the new approach, known as FLAT, we need to calculate the absolute
address, instead of using relative values. Needed defines for memory
location were added.

Fixes: 8db9e2a1b232 ("i40e: base driver")
CC: stable@dpdk.org
Signed-off-by: Qi Zhang <qi.z.zhang@intel.com>
Acked-by: Beilei Xing <beilei.xing@intel.com>