common: Move reset_phy() to net.h

This is a network function so let's move it into that header.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/mach-omap2/emif-common.c b/arch/arm/mach-omap2/emif-common.c
index 290f9dc..c900f28 100644
--- a/arch/arm/mach-omap2/emif-common.c
+++ b/arch/arm/mach-omap2/emif-common.c
@@ -9,6 +9,7 @@
  */
 
 #include <common.h>
+#include <net.h>
 #include <asm/emif.h>
 #include <asm/arch/clock.h>
 #include <asm/arch/sys_proto.h>