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/northbridge/intel/i945/raminit.h

@@ -69,7 +69,6 @@ struct sys_info {
 
 void receive_enable_adjust(struct sys_info *sysinfo);
 void sdram_initialize(int boot_path, const u8 *sdram_addresses);
-unsigned long get_top_of_ram(void);
 int fixup_i945_errata(void);
 void udelay(u32 us);