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linux: Make platform device probe less fragile

Adam Jackson requested to merge ajax/xserver:less-fragile-probe into master

At the point where xf86BusProbe runs we haven't yet taken our own VT, which means we can't perform drm "master" operations on the device. This is tragic, because we need master to fish the bus id string out of the kernel, which we can only do after drmSetInterfaceVersion, which for some reason stores that string on the device not the file handle and thus needs master access.

Fortunately we know the format of the busid string, and it happens to almost be the same as the ID_PATH variable from udev. Use that instead and stop calling drmSetInterfaceVersion.

Signed-off-by: Adam Jackson

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