drm/i915: set DIDL using the ACPI video output device _ADR method return.

we used to set the DIDL in the output device detected order.
But some BIOSes requires it to be initialized in the ACPI device order.
e.g. the value of the first field in DIDL stands for the first
ACPI video output device in ACPI namespace.

Now we initialize the DIDL using the device id, i.e. _ADR return value,
of each ACPI video device, if it is not 0.
https://bugzilla.kernel.org/show_bug.cgi?id=15054



Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Eric Anholt <eric@anholt.net>