drm/i915: DPFLIPSTAT and DPINVGTT registers are VLV only and need an offset

#define PIPEFRAMEPIXEL(pipe)  _PIPE(pipe, _PIPEAFRAMEPIXEL, _PIPEBFRAMEPIXEL)

#define PIPESTAT(pipe) _PIPE(pipe, _PIPEASTAT, _PIPEBSTAT)

#define VLV_DPFLIPSTAT				0x70028

#define VLV_DPFLIPSTAT				(VLV_DISPLAY_BASE + 0x70028)

#define   PIPEB_LINE_COMPARE_INT_EN		(1<<29)

#define   PIPEB_HLINE_INT_EN			(1<<28)

#define   PIPEB_VBLANK_INT_EN			(1<<27)

#define   SPRITEA_FLIPDONE_INT_EN		(1<<17)

#define   PLANEA_FLIPDONE_INT_EN		(1<<16)

#define DPINVGTT				0x7002c /* VLV only */

#define DPINVGTT				(VLV_DISPLAY_BASE + 0x7002c) /* VLV only */

#define   CURSORB_INVALID_GTT_INT_EN		(1<<23)

#define   CURSORA_INVALID_GTT_INT_EN		(1<<22)

#define   SPRITED_INVALID_GTT_INT_EN		(1<<21)