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

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

Patch Review

Adds the chip_data and OF match entry:

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

**Design observation:** Unlike `rk3588_edp` which has `.edp_mode = GRF_REG_FIELD(0x0000, 0, 0)`, the RK3576 data has no `edp_mode` field. This means `rockchip_dp_poweron()` at line 147 (`rockchip_grf_field_write(dp->grf, &dp->data->edp_mode, 1)`) will be a no-op since `.valid` defaults to `false`. Similarly, no `lcdc_sel` field, so the VOP output selection in `rockchip_dp_drm_encoder_enable()` is also a no-op. This is presumably intentional for RK3576 hardware — perhaps the eDP mode is always-on or configured elsewhere, and there's only one VOP path. Given this is v9 with hardware testing, this appears correct.

No blocking issues.

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