drm/panel: lvds: Simplify mode parsing

The mode parsing is currently implemented in three steps:
of_get_display_timing() - DT panel-timing to struct display_timing
videomode_from_timing() - struct display_timing to struct videomode
drm_display_mode_from_videomode() - struct videomode to struct drm_display_mode

Replace all that with simple of_get_drm_panel_display_mode() call,
which already populates struct drm_display_mode and then duplicate
that mode in panel_lvds_get_modes() each time, since the mode does
not change.

Nice bonus is the bus_flags parsed by of_get_drm_panel_display_mode()
out of panel-timing DT node, which is used in subsequent patch to fix
handling of 'de-active' DT property.

Tested-by: Christoph Niedermaier <[email protected]>
Signed-off-by: Marek Vasut <[email protected]>
Cc: Christoph Niedermaier <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Dmitry Osipenko <[email protected]>
Cc: Laurent Pinchart <[email protected]>
Cc: Robert Foss <[email protected]>
Cc: Sam Ravnborg <[email protected]>
Cc: Thomas Zimmermann <[email protected]>
To: [email protected]
Reviewed-by: Laurent Pinchart <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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