ASoC: intel: Standardize ASoC menu

Current Kconfig menu at [ALSA for SoC audio support] has no rules.
So, some venders are using menu style, some venders are listed each drivers
on top page, etc. It is difficult to find target vender and/or drivers
because it is very random.

Let's standardize ASoC menu

Signed-off-by: Kuninori Morimoto <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Acked-by: Peter Ujfalusi <[e-mail]>
Signed-off-by: Mark Brown <[e-mail]>

sound/soc/intel/Kconfig

···
 # SPDX-License-Identifier: GPL-2.0-only
+menu "Intel"
+
 config SND_SOC_INTEL_SST_TOPLEVEL
 	bool "Intel ASoC SST drivers"
 	default y
···
 
 # ASoC codec drivers
 source "sound/soc/intel/boards/Kconfig"
+
+endmenu