ixgbe: use primary and block terminology

DPDK commit message

net/ixgbe/base: replace non-inclusive language
This patch removes non-inclusive language from code, user interface
and comments.

Signed-off-by: Marcin Jurczak <marcin.jurczak@intel.com>
Reviewed-by: Alice Michael <alice.michael@intel.com>

Obtained from: DPDK (f12a4bd)

(cherry picked from commit 4530d49e68d331e9168d3a216d8a4b8e0d547578)