controls: Update argument handling for controls generation scripts

The template file to the gen-controls.py and gen-py-controls.py is now
passed in through the '-t' or '--template' command line argument instead
of being a positional argument.  This will allow multiple input files to
be provided to the scripts in a future commit.

Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

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