[PATCH v2] fix some output pcms being namehint-ed as input pcms

[sylvain.bertrand@xxxxxxxxx]

This is additional cleanup following:

commit d434638a683c01bd6decf8f41863044055237a50
    namehint: remember the direction from the upper levels

signed-off-by: Sylvain BERTRAND <sylvain.bertrand@xxxxxxxxxx>
---
based on arecord -L output 
--- a/share/alsa/pcm/front.conf
+++ b/share/alsa/pcm/front.conf
@@ -53,6 +53,7 @@
 			name defaults.namehint.basic
 		}
 		description "Front speakers"
-		device $DEV
+		device_output $DEV
+		omit_noargs true
 	}
 }

--- a/share/alsa/pcm/iec958.conf
+++ b/share/alsa/pcm/iec958.conf
@@ -78,6 +78,6 @@
 			name defaults.namehint.basic
 		}
 		description "IEC958 (S/PDIF) Digital Audio Output"
-		device $DEV
+		device_output $DEV
 	}
 }