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 */ }
+};
```

**Question/concern**: The RK3576 chip data does not set `edp_mode`, unlike RK3588 which has `.edp_mode = GRF_REG_FIELD(0x0000, 0, 0)`. This is *functionally safe* — `rockchip_grf_field_write()` checks `!field->valid` and returns 0 for unset fields (line 107 in `analogix_dp-rockchip.c`). However, the commit message states RK3576 "fully match[es] the proven RK3588 design." If the hardware really does match RK3588, does RK3576 not have an eDP mode selection bit in its VO0 GRF? If it does, it should be populated here. If it genuinely doesn't need one, a brief comment or commit message note explaining why would be helpful.

**Also**: The single-entry array (vs RK3588's two entries) correctly reflects that RK3576 has only one eDP controller.

The DT match table addition maintains alphabetical ordering:

```c
+	{.compatible = "rockchip,rk3576-edp", .data = &rk3576_edp },
```

Overall this patch is fine, but the missing `edp_mode` relative to RK3588 deserves confirmation from the author.

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