drm/panic: Split draw_panic_plane()

Move locking and parameters from draw_panic_plane() into the new
helper drm_panic_display_panic_screen(). Call draw_panic_plane() from
there.

The new helper drm_panic_display_panic_screen() is now the DRM core's
interface for displaying a panic screen. The code remaining in
draw_panic_plane() still does all the heavy lifting. It will become a
plane helper for DRM drivers.

v2:
- use panic_type argument in draw_panic_plane() (Sashiko)

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Link: https://patch.msgid.link/20260911124540.279841-10-tzimmermann@suse.de

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