arm64: dts: rockchip: Add OPP voltage ranges to RK3399 OP1 SoC dtsi

arm64: dts: rockchip: Add OPP voltage ranges to RK3399 OP1 SoC dtsi

Add support for voltage ranges to the CPU, GPU and DMC OPPs defined in the
SoC dtsi for Rockchip OP1, as a variant of the Rockchip RK3399.  This may be
useful if there are any OP1-based boards whose associated voltage regulators
are unable to deliver the exact voltages; otherwise, it causes no functional
changes to the resulting OPP voltages at runtime.

These changes cannot cause stability issues or any kind of damage, because
it's perfectly safe to use the highest voltage from an OPP group for each OPP
in the same group.  The only possible negative effect of using higher voltages
is wasted energy in form of some additionally generated heat.

Reported-by: Quentin Schulz <quentin.schulz@cherry.de>
Signed-off-by: Dragan Simic <dsimic@manjaro.org>
Link: https://lore.kernel.org/r/dbee35c002bda99e44f8533623d94f202a60da95.1730881777.git.dsimic@manjaro.org
Signed-off-by: Heiko Stuebner <heiko@sntech.de>