mips: ath79: Add support for ungating ethernet on ar933x and ar934x

Add code to ungate the ethernet controller on ar933x and ar934x .

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Cc: Wills Wang <wills.wang@live.com>
diff --git a/arch/mips/mach-ath79/include/mach/ath79.h b/arch/mips/mach-ath79/include/mach/ath79.h
index 682b6a2..2c6c118 100644
--- a/arch/mips/mach-ath79/include/mach/ath79.h
+++ b/arch/mips/mach-ath79/include/mach/ath79.h
@@ -140,6 +140,7 @@
 	return soc_is_tp9343() || soc_is_qca9561();
 }
 
+int ath79_eth_reset(void);
 int ath79_usb_reset(void);
 
 #endif /* __ASM_MACH_ATH79_H */