x86: acpi: Add common Intel ACPI tables

Add various tables that are common to Intel CPUs. These functions can be
used by arch-specific CPU code.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/core/Kconfig b/drivers/core/Kconfig
index 00d1d80..1ca5d66 100644
--- a/drivers/core/Kconfig
+++ b/drivers/core/Kconfig
@@ -277,4 +277,13 @@
 	  things like generating device-specific tables and returning the ACPI
 	  name of a device.
 
+config INTEL_ACPIGEN
+	bool "Support ACPI table generation for Intel SoCs"
+	depends on ACPIGEN
+	help
+	  This option adds some functions used for programatic generation of
+	  ACPI tables on Intel SoCs. This provides features for writing CPU
+	  information such as P states and T stages. Also included is a way
+	  to create a GNVS table and set it up.
+
 endmenu