soundwire: Enable compilation

Enable soundwire driver compilation.

Change-Id: I6b0d0e247150827268987216ce7fd41d53816b86
Signed-off-by: Banajit Goswami <bgoswami@codeaurora.org>
diff --git a/drivers/Makefile b/drivers/Makefile
index e7ebee4..1419893 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -80,6 +80,7 @@
 obj-$(CONFIG_MTD)		+= mtd/
 obj-$(CONFIG_SPI)		+= spi/
 obj-$(CONFIG_SPMI)		+= spmi/
+obj-$(CONFIG_SOUNDWIRE)		+= soundwire/
 obj-$(CONFIG_SLIMBUS)		+= slimbus/
 obj-$(CONFIG_HSI)		+= hsi/
 obj-y				+= net/