drm/panel: lvds: Use bus_flags from DT panel-timing property

This driver currently rewrites bus_flags based solely on the value of
DT property 'data-mirror' and ignores bus_flags which might have been
set in DT panel-timing node. Specificaly, the 'de-active' DT property
sets DRM_BUS_FLAG_DE_ bus_flags.

Since of_get_drm_panel_display_mode() conveniently parses the bus_flags
out of DT panel-timing property, just ORR them with bus_flags inferred
from 'data-mirror' DT property and use the result as panel bus_flags.

This fixes handling of panels with 'panel-timing { de-active = <1>; };'.

Reviewed-by: Laurent Pinchart <[email protected]>
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]
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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