net: dwc_eth_qos: Add glue driver for GMAC on Rockchip RK3568

Add a new glue driver for Rockchip SoCs, i.e RK3568, with a GMAC based
on Synopsys DWC Ethernet QoS IP.

rk_gmac_ops was ported from linux commit:
3bb3d6b1c195 ("net: stmmac: Add RK3566/RK3568 SoC support")

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index d4af253..1d444f5 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -20,6 +20,7 @@
 obj-$(CONFIG_DSA_SANDBOX) += dsa_sandbox.o
 obj-$(CONFIG_DWC_ETH_QOS) += dwc_eth_qos.o
 obj-$(CONFIG_DWC_ETH_QOS_IMX) += dwc_eth_qos_imx.o
+obj-$(CONFIG_DWC_ETH_QOS_ROCKCHIP) += dwc_eth_qos_rockchip.o
 obj-$(CONFIG_DWC_ETH_QOS_QCOM) += dwc_eth_qos_qcom.o
 obj-$(CONFIG_DWC_ETH_QOS_STARFIVE) += dwc_eth_qos_starfive.o
 obj-$(CONFIG_E1000) += e1000.o