Claude review: arm64: dts: renesas: r8a779g0: Add DSC

[Claude Code Review Bot <claude-review@example.com>]

Patch Review

Correctly inserts the DSC node between DU and DSI1 in the SoC dtsi, rewiring:
- `du_out_dsi1` → `dsc_in_dsi1` (was `dsi1_in`)
- `dsc_out_dsi1` → `dsi1_in`
- `dsi1_in` ← `dsc_out_dsi1` (was `du_out_dsi1`)

The DSC node is `status = "disabled"` by default, which is correct — boards that need it enable it explicitly (patches 6 and 7).

Note that this patch changes the `du_out_dsi1` remote-endpoint, which means the DSI1 pipeline is broken on any board that doesn't also enable the DSC. Since DSI1 was previously connected directly to `dsi1_in`, any board using DSI1 without the DSC driver loaded would fail. However, looking at the existing tree, DSI1 usage already requires explicit board-level enablement, and the DSC is `disabled` by default, so the DT graph won't resolve unless DSC is also enabled. This should be fine — but it's worth noting that this is a potential bisection hazard if patches 5, 6, and 7 don't land together. The commit message could mention this dependency.

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