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Add support for external LED application.

Add support for a callback script/application to control LEDs.

This commits adds the ability to control a LED via an external application. The API is simple and is described in 'iopsys-brcm63xx-arm/tiger/base-files/sbin/external_led_ctrl.sh'.

To avoid unnecessary execution of the callback-script, logic has been added to keep track on when to update the LEDs.

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