dts: renesas: add rcar gen4 ca76 base dtsi

[soburi]

Summary

• add a shared rcar_gen4_ca76.dtsi covering the Cortex-A76 common blocks
• refactor r8a779g0.dtsi to include the new base description

Testing

• Not run (not requested)

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https://chatgpt.com/codex/tasks/task_e_69096d461b148322b3d57aec9eb4af84

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Keep r8a779g0 SoC nested under rcar_gen4 series

The new entry for the A76 cluster was added by moving r8a779g0 out of the socs: list under the rcar_gen4 series. In the current YAML the block starting with - name: r8a779g0 is aligned with the series entries (lines 17‑20), so it is now interpreted as a third series element that lacks the required socs: key. Any tooling that expects family → series → socs → cpuclusters (e.g. SoC documentation and board metadata generators) will fail to find the r8a779g0 SoC or may error when parsing this malformed structure. The r8a779g0 block should remain indented beneath rcar_gen4.socs like the original file so that both R52 and A76 clusters are described as variants of the same SoC.

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