fec: Add support for reading RMON registers

Add ethtool operation to read RMON registers.

Tested against net-next on i.MX28.

v2: make conditional on #ifndef CONFIG_M5272

Signed-off-by: Chris Healy <cphealy@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc drivers/net/ethernet/freescale/fec.h
Simple merge

diff --cc drivers/net/ethernet/freescale/fec_main.c
Simple merge