dt-bindings: samsung: exynos-sysreg: add gs101 dpu compatible

Add dedicated compatibles for gs101 dpu sysreg controllers to the
documentation.

Reviewed-by: André Draszik <andre.draszik@linaro.org>
Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20260113-dpu-clocks-v3-3-cb85424f2c72@linaro.org
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>

Author: petegriffin

Documentation/devicetree/bindings/soc/samsung/samsung,exynos-sysreg.yaml

@@ -15,6 +15,7 @@ properties:
       - items:
           - enum:
               - google,gs101-apm-sysreg
+              - google,gs101-dpu-sysreg
               - google,gs101-hsi0-sysreg
               - google,gs101-hsi2-sysreg
               - google,gs101-misc-sysreg
@@ -92,6 +93,7 @@ allOf:
         compatible:
           contains:
             enum:
+              - google,gs101-dpu-sysreg
               - google,gs101-hsi0-sysreg
               - google,gs101-hsi2-sysreg
               - google,gs101-misc-sysreg