drm/amd/display: Initialize get_bytes_per_element's default to 1

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                        "drivers/gpu/drm/amd/display/dc/dml/dcn20/display_rq_dlg_calc_20v2.c",
                        "drivers/gpu/drm/amd/display/dc/dml/dcn21/display_rq_dlg_calc_21.c"
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