ASoC: adi: 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]
Signed-off-by: Mark Brown <[e-mail]>

sound/soc/adi/Kconfig

···
 # SPDX-License-Identifier: GPL-2.0-only
-config SND_SOC_ADI
-	tristate "Audio support for Analog Devices reference designs"
-	help
-	  Audio support for various reference designs by Analog Devices.
+menu "Analog Devices"
 
 config SND_SOC_ADI_AXI_I2S
 	tristate "AXI-I2S support"
-	depends on SND_SOC_ADI
 	select SND_SOC_GENERIC_DMAENGINE_PCM
 	select REGMAP_MMIO
 	help
···
 
 config SND_SOC_ADI_AXI_SPDIF
 	tristate "AXI-SPDIF support"
-	depends on SND_SOC_ADI
 	select SND_SOC_GENERIC_DMAENGINE_PCM
 	select REGMAP_MMIO
 	help
 	  ASoC driver for the Analog Devices AXI-SPDIF softcore peripheral.
+
+endmenu