drm/panel: Add an API to allow drm to set orientation from panel

Panels usually call drm_connector_set_panel_orientation(), which is
later than drm/kms driver calling drm_dev_register(). This leads to a
WARN().

The orientation property is known earlier. For example, some panels
parse the property through device tree during probe.

Add an API to return the property from panel to drm/kms driver, so the
drivers are able to call drm_connector_set_orientation_from_panel() before
drm_dev_register().

Suggested-by: Hans de Goede <[email protected]>
Signed-off-by: Hsin-Yi Wang <[email protected]>
Reviewed-by: Hans de Goede <[email protected]>
Reviewed-by: Douglas Anderson <[email protected]>
Reviewed-by: Stephen Boyd <[email protected]>
[dianders: removed space before tab]
Signed-off-by: Douglas Anderson <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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