drm/connector: Add drm_connector_find_by_fwnode() function (v3)

Add a function to find a connector based on a fwnode.

This will be used by the new drm_connector_oob_hotplug_event()
function which is added by the next patch in this patch-set.

Changes in v2:
- Complete rewrite to use a global connector list in drm_connector.c
  rather then using a class-dev-iter in drm_sysfs.c

Changes in v3:
- Add forward declaration for struct fwnode_handle to drm_crtc_internal.h
  (fixes warning reported by kernel test robot <[email protected]>)

Tested-by: Heikki Krogerus <[email protected]>
Signed-off-by: Hans de Goede <[email protected]>
Reviewed-by: Lyude Paul <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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