[dbusproxy] Send thermal shutdown indications on SystemBus
[dbusproxy] Send thermal shutdown indications on SystemBus

For some reason the required bindings for broadcasting thermal shutdown
indications on D-Bus System Bus have never been implemented.

Add bindings required for sending thermal shutdown indication.

Signed-off-by: Simo Piiroinen <6d5e5360bed3d486f7d9fb26b0f737f7d4fd45ee@jollamobile.com>

spiiroin/dsme,spiiroin/dsme