ARM: bcm281xx: Move kona_l2_cache_init() so it can be shared

In preparation for future SoCs, move kona_l2_cache_init() from board
specific board_bcm281xx.c to shared kona.c, so multiple SoC families
can make use of it. Also change the return type to "void", since we
never look at the return code anyway.

Signed-off-by: Markus Mayer <markus.mayer@linaro.org>
Signed-off-by: Matt Porter <mporter@linaro.org>
diff --git a/arch/arm/mach-bcm/kona.h b/arch/arm/mach-bcm/kona.h
index 291eca3..f42aef8 100644
--- a/arch/arm/mach-bcm/kona.h
+++ b/arch/arm/mach-bcm/kona.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013 Broadcom Corporation
+ * Copyright (C) 2012-2014 Broadcom Corporation
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
@@ -13,5 +13,6 @@
 
 #include <linux/reboot.h>
 
+void __init kona_l2_cache_init(void);
 void bcm_kona_setup_restart(void);
 void bcm_kona_restart(enum reboot_mode mode, const char *cmd);