net/tap: define offload capabilities constants
net/tap: define offload capabilities constants

Since the offload values are always the same, these can
just be data instead of code.

Signed-off-by: Stephen Hemminger <06fa905d7f2aaced6dc72e9511c71a2a51e8aead@networkplumber.org>
Acked-by: Keith Wiles <f97a07384723981b442bf4ce37d40edbfd008094@intel.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk