soc/intel/apollolake: use common FADT infrastructure

Instead of having the mainboards duplicate the same boilerplate
code utilize the common FADT infrastructure to reduce duplication.

Change-Id: If824619fd619433974e588050a933d2c19b97ec8
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/14779
Tested-by: build bot (Jenkins)
Reviewed-by: Duncan Laurie <dlaurie@google.com>
Reviewed-by: Andrey Petrov <andrey.petrov@intel.com>
Reviewed-by: Furquan Shaikh <furquan@google.com>
diff --git a/src/soc/intel/apollolake/acpi.c b/src/soc/intel/apollolake/acpi.c
index a5d1dfa..4d610f8 100644
--- a/src/soc/intel/apollolake/acpi.c
+++ b/src/soc/intel/apollolake/acpi.c
@@ -67,10 +67,13 @@
 	return acpi_madt_irq_overrides(current);
 }
 
-void soc_fill_common_fadt(acpi_fadt_t * fadt)
+void acpi_fill_fadt(acpi_fadt_t * fadt)
 {
 	const uint16_t pmbase = ACPI_PMIO_BASE;
 
+	/* Use ACPI 5.0 revision. */
+	fadt->header.revision = ACPI_FADT_REV_ACPI_5_0;
+
 	fadt->sci_int = acpi_sci_irq();
 	fadt->smi_cmd = 0;	/* No Smi Handler as SMI_CMD is 0*/