arm64: dts: rockchip: Add regulator suffix to BPI-R2-Pro

Add -regulator suffix to regulator names on Banana Pi R2 Pro board as
discussed on Mailinglist

Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220906164212.84835-1-linux@fw-web.de


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