drm/object: Add drm_object_property_get_default_value() function

Some functions to create properties (drm_plane_create_zpos_property or
drm_plane_create_color_properties for example) will ask for a range of
acceptable value and an initial one.

This initial value is then stored in the values array for that property.

Let's provide an helper to access this property.

Acked-by: Daniel Vetter <[email protected]>
Reviewed-by: Laurent Pinchart <[email protected]>
Signed-off-by: Dave Stevenson <[email protected]>
Signed-off-by: Maxime Ripard <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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