northbridge: Remove unneeded include <pc80/mc146818rtc.h>

Change-Id: Icae59721db530572d76035975a4e90686bf4fa65
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/30195
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

src/northbridge/intel/haswell/raminit.c

@@ -23,7 +23,6 @@
 #include <ip_checksum.h>
 #include <memory_info.h>
 #include <mrc_cache.h>
-#include <pc80/mc146818rtc.h>
 #include <device/pci_def.h>
 #include <device/dram/ddr3.h>
 #include <smbios.h>