Revert "nanonote-files: add software volume control"

make arecord not working

This reverts commit 28188074d9.

nanonote-files/script-files/etc/asound.conf

@@ -1,26 +0,0 @@
-pcm.!default {
-	type	plug
-	slave {
-		pcm	"softvol"
-	}
-}
-pcm.softvol {
-	type	softvol
-	slave {
-		pcm	"dmix"
-	}
-	control {
-		name	"PCM"
-		card	0
-		count	1
-	}
-}
-# For OSS emulation
-pcm.dsp0 {
-	type plug
-	slave.pcm	"softvol"
-}
-ctl.mixer0 {
-	type hw
-	card 0
-}