dt-bindings: clock: sophgo: Add clock controller of SG2000 series SoC

dt-bindings: clock: sophgo: Add clock controller of SG2000 series SoC

SG2000 series SoC has the same clock as CV1810 series, but the clock
related to A53 is functional in SG2000 series. So a new compatible
string is needed for the new SoC.

Add definition for the clock controller of the SG2000 series SoC.

Link: https://github.com/sophgo/sophgo-doc/releases/tag/sg2000-datasheet-v1.0-alpha
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Inochi Amaoto <inochiama@outlook.com>
Link: https://lore.kernel.org/r/IA1PR20MB495368F185E018767CC6714ABB262@IA1PR20MB4953.namprd20.prod.outlook.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>