vboot: fix CONFIG_RESUME_PATH_SAME_AS_BOOT S3 resume logic

- should not check VBOOT_STARTS_IN_BOOTBLOCK to set context flag
- implement vboot_platform_is_resuming on platforms missing it
- add ACPI_INTEL_HARDWARE_SLEEP_VALUES to two intel southbridges

[ originally https://review.coreboot.org/c/coreboot/+/28750 ]

BUG=b:114018226
TEST=compile coreboot

Change-Id: I1ef0bcdfd01746198f8140f49698b58065d820b9
Signed-off-by: Joel Kitching <kitching@google.com>
Reviewed-on: https://review.coreboot.org/29060
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>

src/soc/intel/baytrail/pmutil.c

@@ -14,6 +14,7 @@
  */
 
 #include <stdint.h>
+#include <arch/acpi.h>
 #include <arch/io.h>
 #include <cbmem.h>
 #include <console/console.h>
@@ -23,6 +24,7 @@
 #include <soc/pci_devs.h>
 #include <soc/pmc.h>
 #include <security/vboot/vbnv.h>
+#include <security/vboot/vboot_common.h>
 
 #if defined(__SIMPLE_DEVICE__)
 
@@ -384,3 +386,11 @@ int vbnv_cmos_failed(void)
 {
 	return rtc_failure();
 }
+
+int vboot_platform_is_resuming(void)
+{
+	if (!(inw(ACPI_BASE_ADDRESS + PM1_STS) & WAK_STS))
+		return 0;
+
+	return acpi_sleep_from_pm1(inl(ACPI_BASE_ADDRESS + PM1_CNT)) == ACPI_S3;
+}