baytrail: ensure init_chromeos() is called in romstage

The TPM needs to have the TPM_Startup command sent to it
on all boot paths. The call init_chromeos() in romstage_common()
fulfills this requirement.

BUG=chrome-os-partner:24057
BRANCH=None
TEST=Built and booted. Was able to suspend to ram multiple times
     in a row.

Change-Id: Id0339a9d82897249d20ff5f62d2dcb8b535310fa
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/176803
Reviewed-by: Todd Broch <tbroch@chromium.org>
Tested-by: Todd Broch <tbroch@chromium.org>
Reviewed-by: Shawn Nematbakhsh <shawnn@chromium.org>
Reviewed-on: http://review.coreboot.org/4974
Tested-by: build bot (Jenkins)
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>

src/soc/intel/baytrail/romstage/romstage.c

@@ -32,6 +32,7 @@
 #include <ramstage_cache.h>
 #include <romstage_handoff.h>
 #include <timestamp.h>
+#include <vendorcode/google/chromeos/chromeos.h>
 #include <baytrail/gpio.h>
 #include <baytrail/iomap.h>
 #include <baytrail/lpc.h>
@@ -179,6 +180,16 @@ static int chipset_prev_sleep_state(void)
 	return prev_sleep_state;
 }
 
+#if CONFIG_CHROMEOS
+static inline void chromeos_init(int prev_sleep_state)
+{
+	/* Normalize the sleep state to what init_chromeos() wants for S3: 2. */
+	init_chromeos(prev_sleep_state == 3 ? 2 : 0);
+}
+#else
+static inline void chromeos_init(int prev_sleep_state) {}
+#endif
+
 /* Entry from the mainboard. */
 void romstage_common(struct romstage_params *params)
 {
@@ -206,6 +217,8 @@ void romstage_common(struct romstage_params *params)
 	else
 		printk(BIOS_DEBUG, "Romstage handoff structure not added!\n");
 
+	chromeos_init(prev_sleep_state);
+
 	/* Save timestamp information. */
 	timestamp_init(ts64_to_tsc(params->ts.times[0]));
 	timestamp_add(TS_START_ROMSTAGE, ts64_to_tsc(params->ts.times[1]));