net/ixgbe: add query rule stats support for FDIR
net/ixgbe: add query rule stats support for FDIR

There are many registeres in x550 support stats of
flow director filters, for example the number of added
or removed rules and the number match or miss match packet
count for this for port, all these important information
can be read form registeres in x550 and display with command
xstats.

Signed-off-by: Wei Zhao <55941fd0e75edbdf274af2cfac8f147525678f08@intel.com>
Acked-by: Wenzhuo Lu <58cb9036bdff9a5412edc3b9f70e105ccf59954f@intel.com>

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