ASoC: codecs: Fix duplicate included sound/soc.h

Clean up the following includecheck warnings:

./sound/soc/codecs/wcd938x.c: sound/soc.h is included more than once.
./sound/soc/codecs/wcd938x-sdw.c: sound/soc.h is included more than
once.

No functional change.

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Link: https://lore.kernel.org/r/1623822667-130511-1-git-send-email-jiapeng.chong@linux.alibaba.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/wcd938x-sdw.c

@@ -7,7 +7,6 @@
 #include <linux/device.h>
 #include <linux/kernel.h>
 #include <linux/component.h>
-#include <sound/soc.h>
 #include <linux/pm_runtime.h>
 #include <linux/irq.h>
 #include <linux/irqdomain.h>

sound/soc/codecs/wcd938x.c

@@ -9,7 +9,6 @@
 #include <linux/kernel.h>
 #include <linux/pm_runtime.h>
 #include <linux/component.h>
-#include <sound/soc.h>
 #include <sound/tlv.h>
 #include <linux/of_gpio.h>
 #include <linux/of.h>