: convert to module_{init,exit}

After looking at a section bug (in the non-modular case, clearly 
non-init code referenced the __initdata parport_nr[]), I thought it was 
time to convert this driver to module_{init,exit}.

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
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