net: stmmac: Add PCI bus info to ethtool driver query output

commit 20e07e2c upstream.

This patch populates the PCI bus info in the ethtool driver query data.

Users will be able to view PCI bus info using 'ethtool -i <interface>'.

Signed-off-by: Wong Vee Khee <vee.khee.wong@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Yongxin Liu <yongxin.liu@windriver.com>