net/ixgbe/base: remove default advertising for x550 2.5G/5G
net/ixgbe/base: remove default advertising for x550 2.5G/5G

We are seeing interoperability issues with switches when 2.5G and 5G
in x550 are advertised by default, so default to off.

Signed-off-by: Todd Fujinaka <466a62000b5b4767fc2c795fe80d3a0328f10ed6@intel.com>
Signed-off-by: Guinan Sun <2859c668e0b5b1e71d3c9d7ddf700c8e237b77a7@intel.com>
Reviewed-by: Wei Zhao <55941fd0e75edbdf274af2cfac8f147525678f08@intel.com>

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