Move the Atheros drivers into drivers/net/ethernet/atheros/ and
make the necessary Kconfig and Makefile changes.

CC: Jay Cliburn <jcliburn@gmail.com>
CC: Chris Snook <chris.snook@gmail.com>
CC: Jie Yang <jie.yang@atheros.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>

Supporting AR8131, and AR8132.
Signed-off-by: NJie Yang <jie.yang@atheros.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>