V4L/DVB (10122): em28xx: don't load em28xx-alsa for em2870 based devices

Like the em2874, the em2870 does not have any analog support, so don't bother
loading the em28xx-alsa module.
Signed-off-by: Devin Heitmueller <dheitmueller@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/em28xx/em28xx-core.c

@@ -465,7 +465,7 @@ int em28xx_audio_setup(struct em28xx *dev)
 	int vid1, vid2, feat, cfg;
 	u32 vid;
 
-	if (dev->chip_id == CHIP_ID_EM2874) {
+	if (dev->chip_id == CHIP_ID_EM2870 || dev->chip_id == CHIP_ID_EM2874) {
 		/* Digital only device - don't load any alsa module */
 		dev->audio_mode.has_audio = 0;
 		dev->has_audio_class = 0;