arm: rmobile: Add cpu_eth_init function

This supports ethernet driver of RMOBILE R8A7740.

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/arch/arm/cpu/armv7/rmobile/Makefile b/arch/arm/cpu/armv7/rmobile/Makefile
index 6554f36..00610fe 100644
--- a/arch/arm/cpu/armv7/rmobile/Makefile
+++ b/arch/arm/cpu/armv7/rmobile/Makefile
@@ -27,6 +27,7 @@
 
 SOBJS = lowlevel_init.o
 COBJS-y += cpu_info.o
+COBJS-y += emac.o
 
 COBJS-$(CONFIG_DISPLAY_BOARDINFO) += board.o
 COBJS-$(CONFIG_GLOBAL_TIMER) += timer.o