drm/xe: Nuke xe's copy of intel_fbdev_fb.h

For some reason xe and i915 each have an identical (fortunately)
copy of intel_fbdev_fb.h. The xe copy actually only gets included
by xe's intel_fbdev_fb.c, and the i915 copy by everyone else,
include intel_fbdev.c which is the actual caller of the
functions declared in the header.

This means the xe and i915 headers are free to define/declare
completely incompatible things and the build would still succeed
as long as the symbol names match.

That is not a good thing, so let's nuke xe's copy of the header
so that everyone will use the same header, and be forced to
agree on the same API/ABI.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240506183331.7720-1-ville.syrjala@linux.intel.comReviewed-by: Jani Nikula <jani.nikula@intel.com>
Acked-by: Lucas De Marchi <lucas.demarchi@intel.com>

drivers/gpu/drm/xe/display/intel_fbdev_fb.h

-/* SPDX-License-Identifier: MIT */
-/*
- * Copyright © 2023 Intel Corporation
- */
-
-#ifndef __INTEL_FBDEV_FB_H__
-#define __INTEL_FBDEV_FB_H__
-
-struct drm_fb_helper;
-struct drm_fb_helper_surface_size;
-struct drm_i915_gem_object;
-struct drm_i915_private;
-struct fb_info;
-struct i915_vma;
-
-struct drm_framebuffer *intel_fbdev_fb_alloc(struct drm_fb_helper *helper,
-			 struct drm_fb_helper_surface_size *sizes);
-int intel_fbdev_fb_fill_info(struct drm_i915_private *i915, struct fb_info *info,
-			      struct drm_i915_gem_object *obj, struct i915_vma *vma);
-
-#endif