ARM: dts: imx6qdl-vicut1.dtsi: Fix LED names

The names should be consistent with the names in imx6dl-victgo.dts

This patch is preparation to unify vicut1 and victgo DTs.

Signed-off-by: David Jander <david@protonic.nl>
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>