sunxi: backport the stmmac driver from kernel 4.13

This adds support for the GMAC which is use in the A64 and other
Allwinner chips by backporting the changes from the kernel versions
4.13.

Some commits are not backported which are adding support for newly
introduced APIs which are not available in kernel 4.9.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

target/linux/sunxi/config-4.9

@@ -146,7 +146,9 @@ CONFIG_DMA_VIRTUAL_CHANNELS=y
 CONFIG_DNOTIFY=y
 CONFIG_DTC=y
 CONFIG_DUMMY_CONSOLE=y
+# CONFIG_DWMAC_DWC_QOS_ETH is not set
 CONFIG_DWMAC_GENERIC=y
+# CONFIG_DWMAC_SUN8I is not set
 CONFIG_DWMAC_SUNXI=y
 CONFIG_DYNAMIC_DEBUG=y
 CONFIG_EDAC_ATOMIC_SCRUB=y

target/linux/sunxi/cortexa53/config-default

@@ -43,6 +43,7 @@ CONFIG_COMMON_CLK_XGENE=y
 # CONFIG_COMPAT is not set
 # CONFIG_DEBUG_ALIGN_RODATA is not set
 CONFIG_DEBUG_RODATA=y
+CONFIG_DWMAC_SUN8I=y
 CONFIG_FRAME_POINTER=y
 # CONFIG_FSL_ERRATUM_A008585 is not set
 CONFIG_GENERIC_BUG_RELATIVE_POINTERS=y

target/linux/sunxi/cortexa7/config-default

@@ -1,3 +1,4 @@
+CONFIG_DWMAC_SUN8I=y
 # CONFIG_MACH_SUN4I is not set
 # CONFIG_MACH_SUN5I is not set
 # CONFIG_PINCTRL_GR8 is not set