soc/apollolake/romstage: Add a timestamp at the start of romstage

Change-Id: Idcfaba08e4705c6219a46dd615ae8b456a8ab5b4
Signed-off-by: Alexandru Gagniuc <alexandrux.gagniuc@intel.com>
Reviewed-on: https://review.coreboot.org/14865
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

src/soc/intel/apollolake/romstage.c

@@ -39,6 +39,7 @@
 #include <soc/romstage.h>
 #include <soc/uart.h>
 #include <string.h>
+#include <timestamp.h>
 
 #define FIT_POINTER				(0x100000000ULL - 0x40)
 
@@ -127,6 +128,7 @@ asmlinkage void car_stage_entry(void)
 	struct romstage_handoff *handoff;
 	struct chipset_power_state *ps = car_get_var_ptr(&power_state);
 
+	timestamp_add_now(TS_START_ROMSTAGE);
 
 	soc_early_romstage_init();
 	disable_watchdog();