cpu/intel,soc/intel: drop Kconfig for hyperthreading

Drop the Kconfig for hyperthreading to be always able to check at
runtime if hyperthreading is supported. Having a Kconfig for this
doesn't have any benefit.

Change-Id: Ib7b7a437d758f7fe4a09738db1eab8189290b288
Signed-off-by: Michael Niewöhner <foss@mniewoehner.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46507
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>

src/soc/intel/skylake/Kconfig

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