ACPI: Recover type of wakeup in acpi_is_wakeup()

Update acpi_slp_type early in ramstage.

Change-Id: I30ec2680d28b880171217e896f48606f8691b099
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/6142
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>

src/lib/hardwaremain.c

@@ -464,6 +464,11 @@ void main(void)
 
 	post_code(POST_CONSOLE_BOOT_MSG);
 
+	/* Handoff sleep type from romstage. */
+#if CONFIG_HAVE_ACPI_RESUME
+	acpi_is_wakeup();
+#endif
+
 	threads_initialize();
 
 	/* Schedule the static boot state entries. */