use new single system_stats script

Signed-off-by: Michel-FK <michel.stempin@funkey-project.com>

FunKey/board/funkey/rootfs-overlay/etc/fkgpiod.conf

@@ -22,4 +22,4 @@ MAP FN+X     TO COMMAND brightness up
 MAP FN+B     TO COMMAND brightness down
 MAP FN+L     TO KEY     KEY_V
 MAP FN+R     TO KEY     KEY_O
-MAP FN+L+R   TO COMMAND display_notif_system_stats
+MAP FN+L+R   TO COMMAND system_stats toggle

FunKey/board/funkey/rootfs-overlay/usr/local/sbin/system_stats

@@ -1,7 +1,25 @@
 #!/bin/sh
 
+# Uncomment the following line to get debug info
+#set -x
+
+SELF="$(basename ${0})"
 UPDATE_PERIOD=2 #seconds
 
+usage() {
+    >2& echo "Usage: ${SELF} [toggle]"
+    exit 1
+}
+
+# Check number of arguments
+if [ ${#} -eq 1 -a "${1}" = "toggle" ]; then
+    notif set 0 " Getting system stats..."
+    killall -s USR1 "${SELF}"
+    exit 0
+elif [ ${#} -ne 0 ]; then
+    usage
+fi
+
 notif_dirty=0
 perform=0