drm/i915/opregion: remove unnecessary ifdefs on CONFIG_ACPI

The whole file is ignored on CONFIG_ACPI=n.
Reviewed-by: Ander Conselvan de Oliveira <conselvan2@gmail.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1460127589-8357-1-git-send-email-jani.nikula@intel.com

drivers/gpu/drm/i915/intel_opregion.c

@@ -246,7 +246,6 @@ struct opregion_asle_ext {
 
 #define MAX_DSLP	1500
 
-#ifdef CONFIG_ACPI
 static int swsci(struct drm_device *dev, u32 function, u32 parm, u32 *parm_out)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
@@ -905,9 +904,6 @@ static void swsci_setup(struct drm_device *dev)
 			 opregion->swsci_gbda_sub_functions,
 			 opregion->swsci_sbcb_sub_functions);
 }
-#else /* CONFIG_ACPI */
-static inline void swsci_setup(struct drm_device *dev) {}
-#endif  /* CONFIG_ACPI */
 
 static int intel_no_opregion_vbt_callback(const struct dmi_system_id *id)
 {
@@ -950,9 +946,7 @@ int intel_opregion_setup(struct drm_device *dev)
 		return -ENOTSUPP;
 	}
 
-#ifdef CONFIG_ACPI
 	INIT_WORK(&opregion->asle_work, asle_work);
-#endif
 
 	base = memremap(asls, OPREGION_SIZE, MEMREMAP_WB);
 	if (!base)