drm/connector: Give connector sysfs devices there own device_type

[ Upstream commit 331de7db ]

Give connector sysfs devices there own device_type, this allows us to
check if a device passed to functions dealing with generic devices is
a drm_connector or not.

A check like this is necessary in the drm_connector_acpi_bus_match()
function added in the next patch in this series.

Tested-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Link: https://lore.kernel.org/r/20210817215201.795062-2-hdegoede@redhat.com


Stable-dep-of: 89434b06 ("usb: typec: altmodes/displayport: Signal hpd low when exiting mode")
Signed-off-by: Sasha Levin <sashal@kernel.org>