drm/stm: Remove usage of drm_display_mode_to_videomode()

There is not much value in the extra conversion step, the calculations
required for the LTDC IP are different than what is used in the
drm_display_mode_to_videomode(), so just do the right ones in the LTDC
driver right away.

Signed-off-by: Marek Vasut <[email protected]>
Cc: Alexandre Torgue <[email protected]>
Cc: Antonio Borneo <[email protected]>
Cc: Benjamin Gaignard <[email protected]>
Cc: Maxime Coquelin <[email protected]>
Cc: Philippe Cornu <[email protected]>
Cc: Sam Ravnborg <[email protected]>
Cc: Vincent Abriou <[email protected]>
Cc: Yannick Fertre <[email protected]>
Cc: [email protected]
Cc: [email protected]
To: [email protected]
Tested-by: Yannick Fertré <[email protected]>
Signed-off-by: Philippe Cornu <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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