ASoC: Add WCD937X slave and core driver

Add wcd937x swr slave and codec driver.
This adds only basic support for codec registration.

Change-Id: I87519a234f14d34a019c8f66652b7224759e639c
Signed-off-by: Rohit kumar <rohitkr@codeaurora.org>

asoc/codecs/Kbuild

@@ -186,6 +186,7 @@ ifeq ($(KERNEL_BUILD), 1)
 	obj-y	+= sdm660_cdc/
 	obj-y	+= msm_sdw/
 	obj-y	+= wcd9360/
+	obj-y	+= wcd937x/
 endif
 # Module information used by KBuild framework
 obj-$(CONFIG_WCD9XXX_CODEC_CORE) += wcd_core_dlkm.o