Fix for screen backlight not working on Planet Computers Astro Slide PDA

Merged Jonathan Esk-Riddell requested to merge work/astro-backlight into master

This fixes the backlight working on these PDA computers

Taken from Gemian project "Debian on the Gemini PDA and Cosmo Communicator" at the request of the author

Edited by Jonathan Esk-Riddell

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