drm: sti: add HDA driver

Add driver to support analog TV ouput.

HDA driver is mapped on drm_bridge and drm_connector structures.
Signed-off-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Reviewed-by: Rob Clark <robdclark@gmail.com>

drivers/gpu/drm/sti/Makefile

@@ -5,4 +5,5 @@ stihdmi-y := sti_hdmi.o \
 obj-$(CONFIG_DRM_STI) = \
 	sti_vtg.o \
 	sti_vtac.o \
-	stihdmi.o
\ No newline at end of file
+	stihdmi.o \
+	sti_hda.o
\ No newline at end of file