Force software rendering on devices that need it

Newbyterequested to merge
Newbyte/Megapixels:newbyte/force-software-rendering into master

This allows Megapixels to work again without any manual configuration on devices like the original Pine64 PinePhone and Samsung Galaxy Note II.

Signed-off-by: Stefan Hansson newbyte@postmarketos.org

Note that large part of the code is just copied from dcp.c. I tried to generalise it at first, but it ended up being non-trivial to make a generalised version of this code so I decided against it given the rule of three.

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