ARM: dts: imx6sl: tolino-shine2hd: fix usbotg1 pinctrl

usb@2184000: 'pinctrl-0' is a dependency of 'pinctrl-names'

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Fixes: 9c7016f1 ("ARM: dts: imx: add devicetree for Tolino Shine 2 HD")
Signed-off-by: Shawn Guo <shawnguo@kernel.org>