drm/panic: Add kunit tests for drm_panic

Add kunit tests for drm_panic.
They check that drawing the panic screen doesn't crash, but they
don't check the correctness of the resulting image.

Reviewed

drm/panic: Add kunit tests for drm_panic

Add kunit tests for drm_panic.
They check that drawing the panic screen doesn't crash, but they
don't check the correctness of the resulting image.

Reviewed-by: Maxime Ripard <mripard@kernel.org>
Link: https://patch.msgid.link/20251216082524.115980-3-jfalempe@redhat.com
Signed-off-by: Jocelyn Falempe <jfalempe@redhat.com>

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