arm64: dts: rockchip: fix pinctrl-names for gpio-leds node on rk3326-odroid-go2

The 'pinctrl-names' property should contain a list of names
to the assigned states. The value 'led_pins' in the gpio-leds
node on rk3326-odroid-go2 is not a state that is normally used,
so change it the common name 'default'.

Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Link: https://lore.kernel.org/r/20200519111444.2208-1-jbx6244@gmail.com


Signed-off-by: Heiko Stuebner <heiko@sntech.de>