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: NFlorian Faber <faberman@linuxproaudio.org>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

include/sound/hdsp.h

@@ -28,6 +28,7 @@ enum HDSP_IO_Type {
 	Multiface,
 	H9652,
 	H9632,
+	RPM,
 	Undefined,
 };