drm/i915: Rename GEN8_PIPE_FLIP_DONE to PRIMARY_FLIP_DONE

It is now clear that this interrupt is for the primary plane and not
something global to the pipe. It also matches what the spec calls it.

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 0d6202a..01c05af 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -4210,7 +4210,7 @@
 #define  GEN8_PIPE_SPRITE_FAULT		(1 << 9)
 #define  GEN8_PIPE_PRIMARY_FAULT	(1 << 8)
 #define  GEN8_PIPE_SPRITE_FLIP_DONE	(1 << 5)
-#define  GEN8_PIPE_FLIP_DONE		(1 << 4)
+#define  GEN8_PIPE_PRIMARY_FLIP_DONE	(1 << 4)
 #define  GEN8_PIPE_SCAN_LINE_EVENT	(1 << 2)
 #define  GEN8_PIPE_VSYNC		(1 << 1)
 #define  GEN8_PIPE_VBLANK		(1 << 0)