ARM: OMAP: move generic EMAC init to separate file

AM35xx SoCs include DaVinci EMAC IP. Initialization code in
board-am3517evm.c is pretty board independent and will work for any
AM35xx based board so move this code to it's own file to be reused by
other boards.

Signed-off-by: Ilya Yanok <yanok@emcraft.com>
Signed-off-by: Igor Grinberg <grinberg@compulab.co.il>
Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/mach-omap2/Makefile b/arch/arm/mach-omap2/Makefile
index bd76394..8d6bcca 100644
--- a/arch/arm/mach-omap2/Makefile
+++ b/arch/arm/mach-omap2/Makefile
@@ -270,4 +270,7 @@
 obj-y					+= $(smsc911x-m) $(smsc911x-y)
 obj-$(CONFIG_ARCH_OMAP4)		+= hwspinlock.o
 
+emac-$(CONFIG_TI_DAVINCI_EMAC)		:= am35xx-emac.o
+obj-y					+= $(emac-m) $(emac-y)
+
 obj-y					+= common-board-devices.o twl-common.o