ARM: dts: rockchip: Add regulators for rk3288-vyasa

Add supporting regulators for rk3288-vyasa board, dc12_vbat is
parent regulatorand followed regulators as are child regulators.
regulator naming conversion followed as per schematic for better
readability and easy for identification.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Acked-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>