Staging: Netlogic XLR/XLS GMAC driver

Add support for the Network Accelerator Engine on Netlogic XLR/XLS
MIPS SoCs. The XLR/XLS NAE blocks can be configured as one 10G
interface or four 1G interfaces. This driver supports blocks
with 1G ports.

Signed-off-by: Ganesan Ramalingam <ganesanr@broadcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>