i915 Invert backlight brightness

[Georgios Dakidis]

lspci -n
00:02.0 0300: 8086:0f31 (rev 0e)
lspci -nn
00:02.0 VGA compatible controller [0300]: Intel Corporation Atom Processor Z36xxx/Z37xxx Series Graphics & Display [8086:0f31] (rev 0e)
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