ACPI S3: Replace acpi_is_wakeup()

It was supposed to return true for both S2 and S3, but
level S2 was never stored in acpi_slp_type or otherwise
implemented.

Change-Id: Ida0165e647545069c0d42d38b9f45a95e78dacbe
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47693
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/lib/hardwaremain.c

@@ -444,7 +444,7 @@ void main(void)
 	post_code(POST_ENTRY_RAMSTAGE);
 
 	/* Handoff sleep type from romstage. */
-	acpi_is_wakeup();
+	acpi_is_wakeup_s3();
 	threads_initialize();
 
 	/* Schedule the static boot state entries. */