[media] drivers:media:radio: Update Kconfig and Makefile for wl128x FM driver

Signed-off-by: Manjunatha Halli <manjunatha_halli@ti.com>
Reviewed-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/radio/Kconfig b/drivers/media/radio/Kconfig
index ecdffa6..f75cdad 100644
--- a/drivers/media/radio/Kconfig
+++ b/drivers/media/radio/Kconfig
@@ -454,4 +454,7 @@
 	  To compile this driver as a module, choose M here: the
 	  module will be called radio-wl1273.
 
+# TI's ST based wl128x FM radio
+source "drivers/media/radio/wl128x/Kconfig"
+
 endif # RADIO_ADAPTERS