arm64: dts: rockchip: Add missing space around regulator-name on rk3368-orion-r68

Add the missing space around the regulator-name property before the typo
spreads to other files.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Link: https://lore.kernel.org/r/20220612223201.2740248-3-niklas.soderlund+renesas@ragnatech.se
Signed-off-by: Heiko Stuebner <heiko@sntech.de>