net/ixgbe/base: support MAC X550em/X557 LED on/off
net/ixgbe/base: support MAC X550em/X557 LED on/off

This patch updates ixgbe_led_[on|off]_t_X550em for MAC or PHY connected
LEDs. To support both MAC or PHY connected LEDs, both MAC and PHY led
control registers are configured.

Signed-off-by: Wei Dai <17e09bedab62904a2ae618ef4468b0b1372334a2@intel.com>
Tested-by: Yuan Peng <8f7613f20c127e29e1ae4d11e8d64be87217a51b@intel.com>

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