arm64: dts: exynos: add dedicated SYSREG compatibles to Exynosautov9

Exynosautov9 has several different SYSREGs, so use dedicated compatibles
for them.

Signed-off-by: Sriranjani P <sriranjani.p@samsung.com>
Reviewed-by: Chanho Park <chanho61.park@samsung.com>
Link: https://lore.kernel.org/r/20221214044342.49766-5-sriranjani.p@samsung.com


Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>