CBMEM: Unify get_top_of_ram()

Change-Id: Ic40a51638873642f33c74d80ac41cf082b2fb177
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/3904
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@google.com>

src/mainboard/emulation/qemu-i440fx/memory.c

@@ -40,7 +40,6 @@ static unsigned long qemu_get_memory_size(void)
 	return tomk;
 }
 
-unsigned long get_top_of_ram(void);
 unsigned long get_top_of_ram(void)
 {
 	return qemu_get_memory_size() * 1024;