src: Remove unused 'include <pc80/mc146818rtc.h>'

Change-Id: I72d7b83ef8c7f9b5b4b4376839279eff9b0a5f8f
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/37484
Reviewed-by: Frans Hendriks <fhendriks@eltan.com>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/southbridge/intel/ibexpeak/smihandler.c

@@ -23,7 +23,6 @@
 #include <cpu/x86/smm.h>
 #include <cpu/intel/em64t101_save_state.h>
 #include <halt.h>
-#include <pc80/mc146818rtc.h>
 #include <cpu/intel/model_2065x/model_2065x.h>
 #include <southbridge/intel/common/finalize.h>
 #include <southbridge/intel/common/pmbase.h>