ni-utils: remove unused wl12xx workaround

The wl12xx WiFi driver is not enabled in our x86_64 configurations.
Additionally it is a workaround introduced for AB#735824 and was never
revisited in AB#779061.

On top of it the assumptions underlying the workaround - that RCU
callbacks are processed in softirqs - no longer apply.

Remove this dead code.

Signed-off-by: Gratian Crisan <gratian.crisan@ni.com>

recipes-core/busybox/files/ifplugd.action

@@ -10,9 +10,6 @@
 
 export INTERFACE=$1
 
-# If there are drivers that need priorities changed, do it
-update_driver_priorities
-
 case "$2" in
    up)
       # On link-up, we're not guaranteed to be on the same network as

recipes-ni/ni-utils/files/functions.common

@@ -695,19 +695,6 @@ update_all_interface_info () {
     done
 }
 
-update_driver_priorities () {
-    for d in /proc/irq/*; do
-        # Adjust wl12xx priority to something
-        # that allows reclamation of RCU objects
-        # through ksoftirqd under prolonged heavy
-        # wireless traffic conditions
-        if [ -d "$d"/wl12xx ]; then
-                echo 7 > "$d"/priority
-                break
-        fi
-    done
-}
-
 # Usage: enable_net_hotplug
 # Sets the flag so that enables hotplug.script to run
 enable_net_hotplug () {