drm/xe/display: clean up compat i915_vgpu.h

There's a bunch of unnecessary stuff not needed by display code. Remove.

Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/e583679c00aae8fec78f988fa857cfc724a9fa2d.1712345787.git.jani.nikula@intel.comSigned-off-by: Jani Nikula <jani.nikula@intel.com>

drivers/gpu/drm/xe/compat-i915-headers/i915_vgpu.h

@@ -9,36 +9,10 @@
 #include <linux/types.h>
 
 struct drm_i915_private;
-struct i915_ggtt;
 
-static inline void intel_vgpu_detect(struct drm_i915_private *i915)
-{
-}
 static inline bool intel_vgpu_active(struct drm_i915_private *i915)
 {
 	return false;
 }
-static inline void intel_vgpu_register(struct drm_i915_private *i915)
-{
-}
-static inline bool intel_vgpu_has_full_ppgtt(struct drm_i915_private *i915)
-{
-	return false;
-}
-static inline bool intel_vgpu_has_hwsp_emulation(struct drm_i915_private *i915)
-{
-	return false;
-}
-static inline bool intel_vgpu_has_huge_gtt(struct drm_i915_private *i915)
-{
-	return false;
-}
-static inline int intel_vgt_balloon(struct i915_ggtt *ggtt)
-{
-	return 0;
-}
-static inline void intel_vgt_deballoon(struct i915_ggtt *ggtt)
-{
-}
 
 #endif /* _I915_VGPU_H_ */