ASoC: SOF: Change SND_SOC_SOF_TOPLEVEL from config to menuconfig

We have growing number of options under SND_SOC_SOF_TOPLEVEL as SOF
adaptation is growing (Intel, NXP, AMD and Mediatek) and new features are
added.
It will make the menuconfig user experience much cleaner if we move the
SOF options under a separate page.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Bard Liao <bard.liao@intel.com>
Reviewed-by: Daniel Baluta <daniel.baluta@gmail.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Link: https://lore.kernel.org/r/20210930070438.16846-1-peter.ujfalusi@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/Kconfig

 # SPDX-License-Identifier: GPL-2.0-only
-config SND_SOC_SOF_TOPLEVEL
+menuconfig SND_SOC_SOF_TOPLEVEL
 	bool "Sound Open Firmware Support"
 	help
 	  This adds support for Sound Open Firmware (SOF). SOF is free and