armv7: update board_init_f function signature

We don't pass arguments when we jump out of assembly code.

Change-Id: Iccf3a6f713e260b08f9ff47e8b542b9e96369166
Signed-off-by: David Hendricks <dhendrix@chromium.org>
Reviewed-on: http://review.coreboot.org/2122
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

src/cpu/samsung/exynos5-common/spl_boot.c

@@ -308,7 +308,7 @@ static int __def_board_wakeup_permitted(void)
 int board_wakeup_permitted(void)
 	__attribute__((weak, alias("__def_board_wakeup_permitted")));
 
-void board_init_f(unsigned long bootflag)
+void board_init_f(void)
 {
 	/*
 	 * The gd struct is only needed for serial initialization. Since this