unify Linux physdev and classdev handling

[Kay Sievers]

Future Linux kernels will not export any property like "physical",
"logical", class, or "bus" device. At the time the current compatibility
interfaces will be removed from the kernel (in 2-3 years), HAL will not
even be able to determine such properties, even if it wanted to.

The kernels class/bus interface will be around for a while, but HAL
should stop handling the devices differently. This patch unifies all
device handling into a single code path.

In a future patch, we should also remove/rename all properties which
include "*physical*" and get rid of the linux.sysfs_path_devices
property.

Thanks,
Kay
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