davinci_emac: move arch-independent defines to separate header

DaVinci EMAC is found not only on DaVinci SoCs but on some OMAP3 SoCs
also. This patch moves common defines from arch-davinci/emac_defs.h to
drivers/net/davinci_emac.h

DaVinci specific PHY drivers hacked to include the new header. We might
want to switch to phylib in future.

Signed-off-by: Ilya Yanok <yanok@emcraft.com>
diff --git a/arch/arm/cpu/arm926ejs/davinci/et1011c.c b/arch/arm/cpu/arm926ejs/davinci/et1011c.c
index df35e44..68650e5 100644
--- a/arch/arm/cpu/arm926ejs/davinci/et1011c.c
+++ b/arch/arm/cpu/arm926ejs/davinci/et1011c.c
@@ -22,6 +22,7 @@
 #include <net.h>
 #include <miiphy.h>
 #include <asm/arch/emac_defs.h>
+#include "../../../../../drivers/net/davinci_emac.h"
 
 #ifdef CONFIG_DRIVER_TI_EMAC