drm/amd: print error on convert_tiling_flags_to_modifier failure

If this function fails, it means the tiling flags didn't make sense.
This likely indicates a user-space bug. Log the error alongside with the
provided tiling flags to make debugging easier.

Signed-off-by: Simon Ser <contact@emersion.fr>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Harry Wentland <hwentlan@amd.com>
Cc: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Cc: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Cc: Michel Dänzer <michel@daenzer.net>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>