drm/amd/display: Remove unsued mutex and spinlock.

	/* Zero all the fields */

	memset(&init_data, 0, sizeof(init_data));

	/* initialize DAL's lock (for SYNC context use) */

	spin_lock_init(&adev->dm.dal_lock);

	/* initialize DAL's mutex */

	mutex_init(&adev->dm.dal_mutex);

	if(amdgpu_dm_irq_init(adev)) {

		DRM_ERROR("amdgpu: failed to initialize DM IRQ support.\n");

		goto error;

	struct dal *dal;

	struct dc *dc;

	struct cgs_device *cgs_device;

	/* lock to be used when DAL is called from SYNC IRQ context */

	spinlock_t dal_lock;

	struct amdgpu_device *adev;	/*AMD base driver*/

	struct drm_device *ddev;	/*DRM base driver*/

	struct list_head timer_handler_list;

	struct workqueue_struct *timer_workqueue;

	/* Use dal_mutex for any activity which is NOT syncronized by

	 * DRM mode setting locks.

	 * For example: amdgpu_dm_hpd_low_irq() calls into DAL *without*

	 * DRM mode setting locks being acquired. This is where dal_mutex

	 * is acquired before calling into DAL. */

	struct mutex dal_mutex;

	struct backlight_device *backlight_dev;

	const struct dc_link *backlight_link;