update sms_tool and socat_at-bridge

-Updated sms_tool binary to the AP aarch64 version

- socat-at-bridge ready to build

ipk-source/socat-at-bridge/CONTROL/prerm

@@ -0,0 +1,9 @@
+#!/bin/ash
+
+echo "Disabling socat-at-bridge at startup"
+service disable socat-at-bridge
+echo "Stopping socat-at-bridge"
+service stop socat-at-bridge
+
+exit 0
+