arm64: dts: renesas: Update 'vsps' properties for readability

Update the 'vsps' property in the R-Car Gen3 SoC device tree files to
match what's in the documentation example.

Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>