arm64: dts: imx8mq-librem5: add USB type-c properties for role switching

Add the connector properties to the USB type-c stanza to enable (PD)
role-switching on the Librem 5 phone.

Signed-off-by: Angus Ainslie <angus@akkea.ca>
Signed-off-by: Martin Kepplinger <martin.kepplinger@puri.sm>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>