drm/i915: s/plane/i9xx_plane/

Call the enum i9xx_plane_id variable i9xx_plane like we do elsewhere.

Cc: Hans de Goede <j.w.r.degoede@gmail.com>
Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180130203807.13721-7-ville.syrjala@linux.intel.comReviewed-by: NMika Kahola <mika.kahola@intel.com>

drivers/gpu/drm/i915/intel_dsi.c

@@ -1665,16 +1665,16 @@ static int intel_dsi_get_panel_orientation(struct intel_connector *connector)
 {
 	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 	int orientation = DRM_MODE_PANEL_ORIENTATION_NORMAL;
-	enum i9xx_plane_id plane;
+	enum i9xx_plane_id i9xx_plane;
 	u32 val;
 
 	if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
 		if (connector->encoder->crtc_mask == BIT(PIPE_B))
-			plane = PLANE_B;
+			i9xx_plane = PLANE_B;
 		else
-			plane = PLANE_A;
+			i9xx_plane = PLANE_A;
 
-		val = I915_READ(DSPCNTR(plane));
+		val = I915_READ(DSPCNTR(i9xx_plane));
 		if (val & DISPPLANE_ROTATE_180)
 			orientation = DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP;
 	}