Sometimes the registers claiming the aperture size on 9XX chipsets lie.

So instead, use the size of the aperture BAR to determine the aperture
size for agp_i810, and don't let the 855 and above have the aperture
set. Next to nothing uses it anyway so no harm.

introduce generic_{get,set} aperture which has this behaviour so other
drivers may use it if useful.

Change inspired by what freebsd did after i noticed my aperture size was
wrong.

Tested by many, ok kettenis@.

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