soc/intel/common/block/acpi: add Kconfig for CPPC entries generation

Change-Id: Ieae9f221ffb27cf52cab21a130e18aa3929caea3
Signed-off-by: Michael Niewöhner <foss@mniewoehner.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47540
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/soc/intel/common/block/acpi/Kconfig b/src/soc/intel/common/block/acpi/Kconfig
index ff59172..d9a7a87 100644
--- a/src/soc/intel/common/block/acpi/Kconfig
+++ b/src/soc/intel/common/block/acpi/Kconfig
@@ -4,3 +4,12 @@
 	bool
 	help
 	  Intel Processor common code for ACPI
+
+if SOC_INTEL_COMMON_BLOCK_ACPI
+
+config SOC_INTEL_COMMON_BLOCK_ACPI_CPPC
+	bool
+	help
+	  Generate CPPC entries for Intel SpeedShift
+
+endif