drm/i915: Remove unused enum "chip_family"

Superseded by the tracking the render generation in the chipset
capabiltiies struct.
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: NKeith Packard <keithp@keithp.com>

drivers/gpu/drm/i915/i915_drv.h

@@ -909,13 +909,6 @@ struct drm_i915_file_private {
 	} mm;
 };
 
-enum intel_chip_family {
-	CHIP_I8XX = 0x01,
-	CHIP_I9XX = 0x02,
-	CHIP_I915 = 0x04,
-	CHIP_I965 = 0x08,
-};
-
 #define INTEL_INFO(dev)	(((struct drm_i915_private *) (dev)->dev_private)->info)
 
 #define IS_I830(dev)		((dev)->pci_device == 0x3577)