Claude review: drm/rockchip: analogix_dp: Add support for RK3576

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

Patch Review

```c
+static const struct rockchip_dp_chip_data rk3576_edp[] = {
+	{
+		.chip_type = RK3576_EDP,
+		.reg = 0x27dc0000,
+	},
+	{ /* sentinel */ }
+};
```

**Notable difference from RK3588**: The RK3576 chip_data does not set `.edp_mode`, unlike RK3588 which has:
```c
.edp_mode = GRF_REG_FIELD(0x0000, 0, 0),
```

This means `rockchip_dp_poweron()` will call `rockchip_grf_field_write(dp->grf, &dp->data->edp_mode, 1)` which checks `field->valid` (which will be `false` since `.edp_mode` is zero-initialized) and returns 0 — so it's a no-op. This is correct behavior if RK3576 doesn't need the edp_mode GRF write, but it would be worth a brief comment or commit message note explaining why this isn't needed for RK3576.

Similarly, `.lcdc_sel` is not set, so the GRF write in `rockchip_dp_drm_encoder_enable()` will also be a no-op. This seems intentional but should be confirmed — does RK3576 not need VOP output routing via GRF?

The Reviewed-by tag from Nicolas Frattaroli is present. The change is otherwise straightforward and follows existing patterns.

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