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Extend the existing test cases to test the conversion from XRGB8888 to XRGB2101010. In order to be able to call drm_fb_xrgb8888_to_xrgb2101010() when compiling CONFIG_DRM_KMS_HELPER as a module export the symbol. Tested-by: Maíra Canal <mairacanal@riseup.net> Reviewed-by: David Gow <davidgow@google.com> Acked-by: Maxime Ripard <maxime@cerno.tech> Signed-off-by: José Expósito <jose.exposito89@gmail.com> Link: https://patchwork.freedesktop.org/patch/msgid/20220926080837.65734-3-jose.exposito89@gmail.com