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>

src/soc/intel/skylake/Kconfig

@@ -24,6 +24,7 @@ config CPU_SPECIFIC_OPTIONS
 	select CACHE_MRC_SETTINGS
 	select CPU_INTEL_COMMON
 	select CPU_INTEL_FIRMWARE_INTERFACE_TABLE
+	select CPU_SUPPORTS_PM_TIMER_EMULATION
 	select FSP_M_XIP
 	select GENERIC_GPIO_LIB
 	select HAVE_FSP_GOP