[PATCH] drm/radeon: add new AMD ACPI header and update relevant code

[Luca Tettamanti]

Hi,
I'm attaching a first draft of my work. The first 3 patches are
infrastructure work, the fourth wires the notification handler and
retrieves the requests from the system BIOS, but it does not actually
change brightness yet.

The problem here is how to get the correct encoder: should I just scan
encoder_list checking for ATOM_DEVICE_LCD_SUPPORT and see if it has a
backlight device attached?
Hopefully there is only one encoder with it, right?

I'm also toying with the idea of creating structures matching the output
of the various ACPI methods, this would remove some ugly pointer
arithmetics, but it _might_ make it easier to read past the buffer if
one does not check the size before using the struct. What do you think?

Luca
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