arm64: dts: rockchip: Add regulator suffix to rock-3a

Add -regulator suffix to regulator names on Radxa ROCK3 Model A
board. This makes the naming more consistent.

Signed-off-by: Chukun Pan <amadeus@jmu.edu.cn>
Acked-by: Michael Riesch <michael.riesch@wolfvision.net>
Link: https://lore.kernel.org/r/20221006152524.502445-2-amadeus@jmu.edu.cn


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