ixgbe/base: add new mac-dependent values for X540 and X550
ixgbe/base: add new mac-dependent values for X540 and X550

Add new values that vary by MAC type that are introduced in
x540, x550.
And remove some meaningless comments BTW.

Signed-off-by: Wenzhuo Lu <58cb9036bdff9a5412edc3b9f70e105ccf59954f@intel.com>
Acked-by: Helin Zhang <aba9dfdb1a6ec8bf1ff66b95272c029f8dfde1b1@intel.com>

tsphillips/dpdk-fork,tsphillips/dpdk-fork,tsphillips/dpdk-fork,msune/dpdk,john-mcnamara-intel/dpdk,mixja/dpdk,msune/dpdk,mixja/dpdk,msune/dpdk,john-mcnamara-intel/dpdk,msune/dpdk,venkynv/dpdk-mirror,mixja/dpdk,venkynv/dpdk-mirror,venkynv/dpdk-mirror,venkynv/dpdk-mirror,mixja/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,tsphillips/dpdk-fork