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Some functions seem to have been renamed without updating the kernel-doc
markup causing warnings. Also, struct intel_vgpu_dmabuf_obj is not
properly documented, but has a kerneld-doc markup.

Fix those warnings:
	drivers/gpu/drm/i915/gvt/aperture_gm.c:308: warning: expecting prototype for inte_gvt_free_vgpu_resource(). Prototype was for intel_vgpu_free_resource() instead
	drivers/gpu/drm/i915/gvt/aperture_gm.c:344: warning: expecting prototype for intel_alloc_vgpu_resource(). Prototype was for intel_vgpu_alloc_resource() instead
	drivers/gpu/drm/i915/gvt/cfg_space.c:257: warning: expecting prototype for intel_vgpu_emulate_cfg_read(). Prototype was for intel_vgpu_emulate_cfg_write() instead
	drivers/gpu/drm/i915/gvt/dmabuf.h:61: warning: Function parameter or member 'vgpu' not described in 'intel_vgpu_dmabuf_obj'
	drivers/gpu/drm/i915/gvt/dmabuf.h:61: warning: Function parameter or member 'info' not described in 'intel_vgpu_dmabuf_obj'
	drivers/gpu/drm/i915/gv...