slippy: Minor vboot related fixes

- Disable EC software sync for now
- Report correct EC active firmware mode
- Force enable developer mode by default
- Set up PCH generic decode regions in romstage
- Pass the oprom_is_loaded flag into vboot handoff data

Change-Id: Ib7ab35e6897c19455cbeecba88160ae830ea7984
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/51155
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/4169
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

src/mainboard/google/slippy/acpi_tables.c

@@ -31,6 +31,7 @@
 #include <cpu/cpu.h>
 #include <cpu/x86/msr.h>
 #include <vendorcode/google/chromeos/gnvs.h>
+#include <ec/google/chromeec/ec.h>
 
 extern const unsigned char AmlCode[];
 #if CONFIG_HAVE_ACPI_SLIC
@@ -88,8 +89,9 @@ static void acpi_create_gnvs(global_nvs_t *gnvs)
 #if CONFIG_CHROMEOS
 	// TODO(reinauer) this could move elsewhere?
 	chromeos_init_vboot(&(gnvs->chromeos));
-	/* Emerald Lake has no EC (?) */
-	gnvs->chromeos.vbt2 = ACTIVE_ECFW_RO;
+
+	gnvs->chromeos.vbt2 = google_ec_running_ro() ?
+		ACTIVE_ECFW_RO : ACTIVE_ECFW_RW;
 #endif
 
 	/* Update the mem console pointer. */