alsa-state: remove PREFERRED_VERSION_linux-dey override

Now each platform is only supported in one kernel version, so there is
no need to have multiple alsa config files per linux kernel version.

https://jira.digi.com/browse/DEL-1747

Signed-off-by: Javier Viguera <javier.viguera@digi.com>

meta-digi-arm/recipes-bsp/alsa-state/alsa-state.bbappend

@@ -1,6 +1,6 @@
 # Copyright (C) 2013 Digi International.
 
-FILESEXTRAPATHS_prepend := "${THISDIR}/${BPN}/${PREFERRED_VERSION_linux-dey}:"
+FILESEXTRAPATHS_prepend := "${THISDIR}/${BPN}:"
 
 SRC_URI += " \
     file://asound.inline_play.state \