Draft: i2c_smbus_linux: only inspect /sys/class/i2c-dev/

nick blackrequested to merge
dankamongmen/OpenRGB:dankamongmen/i2c-sys-class into master

All i2c interface devices we might want can be found in /sys/class/i2c-dev, and indeed only those devices we want are found there. Enumerate that /sys entry instead of /sys/bus/i2c/devices, and we can toss this prefix comparison as well.

[schwarzgerat](0) $ ls /sys/class/i2c-dev/
i2c-0  i2c-1  i2c-2  i2c-3  i2c-4  i2c-5  i2c-6  i2c-7  i2c-8  i2c-9
[schwarzgerat](0) $ ls /sys/bus/i2c/devices/
0-0050  0-0052  0-0054  0-0056  2-0008  i2c-1  i2c-3  i2c-5  i2c-7  i2c-9
0-0051  0-0053  0-0055  0-0057  i2c-0   i2c-2  i2c-4  i2c-6  i2c-8
[schwarzgerat](0) $
Edited by nick black

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