ASoC: Add missing DRV_NAME definitions for fsl/* drivers

Module builds are broken due to missing DRV_NAME for
efika-audio-fabric and pcm030-audio-fabric.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/soc/fsl/pcm030-audio-fabric.c b/sound/soc/fsl/pcm030-audio-fabric.c
index 8766f7a..b928ef7 100644
--- a/sound/soc/fsl/pcm030-audio-fabric.c
+++ b/sound/soc/fsl/pcm030-audio-fabric.c
@@ -30,6 +30,8 @@
 #include "mpc5200_psc_ac97.h"
 #include "../codecs/wm9712.h"
 
+#define DRV_NAME "pcm030-audio-fabric"
+
 static struct snd_soc_device device;
 static struct snd_soc_card card;