ath25: drop target specific button hotplug

The ath25 target has its own unique button action config support, which is not
used anywhere except for two example logger statements in UCI.

Since there is a generic /etc/rc.button facility since some time already there
is no reason at all to keep this target specific mechanism anymore, so simply
drop it.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

target/linux/ath25/base-files/etc/config/system

@@ -7,17 +7,3 @@ config timeserver ntp
 	list server	1.openwrt.pool.ntp.org
 	list server	2.openwrt.pool.ntp.org
 	list server	3.openwrt.pool.ntp.org
-
-config button
-	option button	reset
-	option action	released
-	option handler	"logger reboot"
-	option min		0
-	option max		4
-
-config button
-	option button	reset
-	option action	released
-	option handler	"logger factory default"
-	option min		5
-	option max		30

target/linux/ath25/base-files/etc/hotplug.d/button/00-button

@@ -1,24 +0,0 @@
-. /lib/functions.sh
-do_button () {
-	local button
-	local action
-	local handler
-	local min
-	local max
-
-	config_get button $1 button
-	config_get action $1 action
-	config_get handler $1 handler
-	config_get min $1 min
-	config_get max $1 max
-	
-	[ "$ACTION" = "$action" -a "$BUTTON" = "$button" -a -n "$handler" ] && {
-		[ -z "$min" -o -z "$max" ] && eval $handler 
-		[ -n "$min" -a -n "$max" ] && {
-			[ $min -le $SEEN -a $max -ge $SEEN ] && eval $handler 
-		}
-	}
-}
-
-config_load system
-config_foreach do_button button