ASoC: dwc: 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/dwc/Kconfig

···
 # SPDX-License-Identifier: GPL-2.0-only
+menu "DesignWare"
+
 config SND_DESIGNWARE_I2S
 	tristate "Synopsys I2S Device Driver"
 	depends on HAVE_CLK
···
 	 This functionality is specially suited for I2S devices that don't have
 	 DMA support.
 
+endmenu