drm/i915/guc: Small fixups post code move

drm/i915/guc: Small fixups post code move

Existing code needs some style fixes. To avoid polluting
pure move patch, do it now as separate step.

Suggested-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171016144724.17244-4-michal.wajdeczko@intel.com