drm/sysfb: Use preferred panel size for panel orientation quirks

Sysfb drivers currently use the given display mode for looking up the
panel orientation. But the look-up table stores the native geometry of
the panels, so the lookup fails if the current mode sizes differs.

Get the panel's native geometry with drm_edid_detect_panel_size() from
the EDID and use it for looking up the panel orientation.

v2:
- ofdrm: validate EDID header before using it (Sashiko)

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patch.msgid.link/20260904090850.43060-4-tzimmermann@suse.de

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