net: Add drivers for Sysnopsys Ethernet 10G device

This driver support the Synopsys Designware Ethernet 10G
IP block refer from the driver dwc_eth_qos.

The driver MAC register mapping is different between
Synopsys QoS IP and Synopsys 10G IP, and thus new file
is created meant for Sysnopsys 10G IP.

The dwc_eth_xgmac_socfpga.c is specific to a device family,
the driver support the specific configuration used in
Intel SoC FPGA Agilex5.

This driver is extensible for other device family to use.

Signed-off-by: Boon Khai Ng <boon.khai.ng@intel.com>