timer: Change timer util functions to 64-bit

Since mono_time is now 64-bit, the utility functions interfacing with
mono_time should also be 64-bit so precision isn't lost.

Fixed build errors related to printing the now int64_t result of
stopwatch_duration_[m|u]secs in various places.

BUG=b:237082996
BRANCH=All
TEST=Boot dewatt

Change-Id: I169588f5e14285557f2d03270f58f4c07c0154d5
Signed-off-by: Rob Barnes <robbarnes@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66170
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>

src/cpu/x86/mp_init.c

@@ -525,7 +525,7 @@ static enum cb_err bsp_do_flight_plan(struct mp_params *mp_params)
 		release_barrier(&rec->barrier);
 	}
 
-	printk(BIOS_INFO, "%s done after %ld msecs.\n", __func__,
+	printk(BIOS_INFO, "%s done after %lld msecs.\n", __func__,
 	       stopwatch_duration_msecs(&sw));
 	return ret;
 }