soc/intel: drop Kconfig PM_ACPI_TIMER_OPTIONAL

Technically, it's not depending on the hardware but on the software
(OS/payload), if the PM Timer is optional. OSes with ACPI >= 5.0A
support disabling of the PM Timer, when the respective FADT flag is
unset. Thus, drop this guard.

For platforms without hardware PM Timer (Apollo Lake, Gemini Lake) the
Kconfig `USE_PM_ACPI_TIMER` depends on `!NO_PM_ACPI_TIMER`.

As of this change, new platforms must either implement code for
disabling the hardware PM timer or select `NO_PM_ACPI_TIMER` if no such
is present.

Change-Id: I973ad418ba43cbd80b023abf94d3548edc53a561
Signed-off-by: Michael Niewöhner <foss@mniewoehner.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58017
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Lance Zhao

src/soc/intel/jasperlake/Kconfig

@@ -31,7 +31,6 @@ config CPU_SPECIFIC_OPTIONS
 	select PARALLEL_MP_AP_WORK
 	select MICROCODE_BLOB_UNDISCLOSED
 	select PLATFORM_USES_FSP2_2
-	select PM_ACPI_TIMER_OPTIONAL
 	select PMC_GLOBAL_RESET_ENABLE_LOCK
 	select SOC_INTEL_COMMON
 	select SOC_INTEL_COMMON_ACPI_WAKE_SOURCE