New backlight API relying on udevHEADmaster

libpciaccess was sending a handler to be used to find and match an appropriate
backlight. Non-PCI devices would have to rely on libpciaccess anyway or
alternatively use the DRM tripe (card id, connector_type and
connector_type_id) for doing so (and the DRM tripe was not working anyway when
card equals 0). Besides, find & match of devices is not the real intention of
libpciaccess and for such we have UDEV.

This commit removes the matching logic that uses libpciaccess and the DRM
tripe, using instead the UDEV handler of a connector device and the type. Such
alternative is quite flexible for configuration, and is inspired by systemd:
    http://www.freedesktop.org/wiki/Software/systemd/multiseat

Signed-off-by: Tiago Vignatti <tiago.vignatti@intel.com>

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