[Intrepid] SRU: Backport fix for handling the brightness control on acer-wmi

[Stefan Bader]

SRU justification:

Impact: With the introduction of the upstream acpi backlight handling we 
introduced a inverse check which causes the acer-wmi driver only to be active 
if the acpi driver is present.

Fix: Invert the check.

Testcase: Without acpi support on acer laptops, there is no backlight control 
device.

Note: there still seems to be another problem with the acer-wmi interface in 
general but this is definitely a required step to the solution.

-- 

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