drm/{i915, xe}/fbdev: pass struct drm_device to intel_fbdev_fb_alloc()

drm/{i915, xe}/fbdev: pass struct drm_device to intel_fbdev_fb_alloc()

[ Upstream commit 9e5cf822a207ee8c9856024c047abaccb4d185e5 ]

The function doesn't actually need struct drm_fb_helper for anything,
just pass struct drm_device.

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://lore.kernel.org/r/16360584f80cdc5ee35fd94cfd92fd3955588dfd.1758184771.git.jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Stable-dep-of: 460b31720369 ("drm/i915/fbdev: Hold runtime PM ref during fbdev BO creation")
Signed-off-by: Sasha Levin <sashal@kernel.org>