coreboot: move TS_END_ROMSTAGE to one spot

While the romstage code flow is not consistent across all
mainboards/chipsets there is only one way of running ramstage
from romstage -- run_ramstage(). Move the
timestamp_add_now(TS_END_ROMSTAGE) to be within run_ramstage().

BUG=chrome-os-partner:44827
BRANCH=None
TEST=Built and booted glados. TS_END_ROMSTAGE still present in
     timestamp table.

Change-Id: I4b584e274ce2107e83ca6425491fdc71a138e82c
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/11700
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/soc/intel/common/romstage.c

@@ -207,8 +207,6 @@ asmlinkage void romstage_after_car(void *chipset_context)
 	soc_after_temp_ram_exit();
 	soc_display_mtrrs();
 
-	timestamp_add_now(TS_END_ROMSTAGE);
-
 	/* Load the ramstage. */
 	copy_and_run();
 	die("ERROR - Failed to load ramstage!");