net/ixgbe: allow setting 2.5G and 5G speeds on X550
net/ixgbe: allow setting 2.5G and 5G speeds on X550

This patch adds support for explicitly selecting 2.5G and 5G speeds on
X550.

Signed-off-by: Martin Weiser <6fd42917c7e79abba76c520bd0cd60435f9d6aa0@allegro-packets.com>
Acked-by: Wenzhuo Lu <58cb9036bdff9a5412edc3b9f70e105ccf59954f@intel.com>

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