linux: Force DRM_I915 to be a module
For some cards, DRM_I915 requires firmware. This is not correct to have it as built-in if firmware is not embedded in the kernel. Otherwise initialization fail, and DRM is not available on the device.
For some cards, DRM_I915 requires firmware. This is not correct to have it as built-in if firmware is not embedded in the kernel. Otherwise initialization fail, and DRM is not available on the device.