video: of: display_timing: Don't yell if no timing node is present

There may be cases (like in panel-simple.c) where we have a sane
fallback if no timings are specified in the device tree.  Let's get
rid of the unconditional pr_err().  We can add error messages in
individual drivers if it makes sense.

NOTE: we'll still print errors if the node is present but there are
problems parsing the timings.

Fixes: b8a2948fa2b3 ("drm/panel: simple: Add ability to override typical timing")
Reported-by: Sam Ravnborg <[email protected]>
Signed-off-by: Douglas Anderson <[email protected]>
Reviewed-by: Sam Ravnborg <[email protected]>
Cc: Thierry Reding <[email protected]>
Cc: David Airlie <[email protected]>
Cc: Philipp Zabel <[email protected]>
Cc: Tomi Valkeinen <[email protected]>
Cc: Laurent Pinchart <[email protected]>
Cc: Russell King <[email protected]>
Cc: Daniel Vetter <[email protected]>
Signed-off-by: Bartlomiej Zolnierkiewicz <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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