soc/intel/common: add Kconfig for PM Timer emulation support

Add a Kconfig for SoCs to indicate PM ACPI timer emulation support and
select it by the appropriate SoCs.

This Kconfig gets used in the follow-up changes.

Change-Id: I6ded79221a01655f298ff92b8bd2afabd1d2a3ff
Signed-off-by: Michael Niewöhner <foss@mniewoehner.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46017
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
diff --git a/src/soc/intel/apollolake/Kconfig b/src/soc/intel/apollolake/Kconfig
index da57931..c1b5252 100644
--- a/src/soc/intel/apollolake/Kconfig
+++ b/src/soc/intel/apollolake/Kconfig
@@ -26,6 +26,7 @@
 	# CPU specific options
 	select CPU_INTEL_COMMON
 	select CPU_INTEL_FIRMWARE_INTERFACE_TABLE
+	select CPU_SUPPORTS_PM_TIMER_EMULATION
 	select IOAPIC
 	select PCR_COMMON_IOSF_1_0
 	select SSE2