drm/i915: Shut up GuC errors when it's disabled

DRM_ERROR an continue without any issues aren't allowed since that
causes noise in the CI system. But we absolutely want to have the
DRM_ERROR when we want to run with GuC.

For simplicity just short-circuit all the loader code when it's not
needed.

v2: Mika&Chris complained that I shouldn't hit send on patches written
before coffee kicks in.

v3: Make it compile at least ...

Cc: Alex Dai <[email protected]>
Cc: Dave Gordon <[email protected]>
Cc: Mika Kuoppala <[email protected]>
Cc: Chris Wilson <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]
Reviewed-by: Mika Kuoppala <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>

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