ALSA: hdsp - Add support for RPM io box

Add support for the RME HDSP RPM IO box. Changes have been made in the identification of the IO box and the neccessary controls have been added.

Signed-off-by: Florian Faber <faberman@linuxproaudio.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/include/sound/hdsp.h b/include/sound/hdsp.h
index d98a78d..0909a38 100644
--- a/include/sound/hdsp.h
+++ b/include/sound/hdsp.h
@@ -28,6 +28,7 @@
 	Multiface,
 	H9652,
 	H9632,
+	RPM,
 	Undefined,
 };