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Make LEDS_TRIGGER_HEARTBEAT builtin.

Diederik de Haas requested to merge diederik/linux:make-heartbeat-trigger-builtin into master

The heartbeat trigger is defined as default trigger for LEDs in the DeviceTree in 281 cases of which 268 belong to ARM dts/dtsi files which likely means even more boards/SBC. If the module isn't loaded or builtin, then the trigger gets reset to 'none' which differs from the intend expressed in the dts[i].

The heartbeat trigger is more versatile and also fulfills (more then) the same functionality as the panic trigger, which is already builtin. As blinking of the LED provides important information that the device has started up, make it builtin on all ARM devices.

Closes: #992184

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