[PATCH V2 3/3] drm/amd/display: Protect FPU in dml2_validate()/dml21_validate()

[Dongyan Qian]

Hi Huacai,

Tested successfully with `glmark2` on both x86 and Loongson platforms, using AMD Radeon RX 9070 XT.

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**Intel i5-10400F Platform:**

- **Board / CPU**: Intel i5-10400F
- **Firmware Vendor**: American Megatrends International, LLC
- **Kernel**: https://lore.kernel.org/all/20250327095334.3327111-3-chenhuacai@loongson.cn/
- **GPU**: AMD Navi 48 [RX 9070/9070 XT]
- **Result**: `glmark2` score 18703

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**Loongson 3C6000 Platform:**

- **Board / CPU**: 3C6000 AC612A0
- **Firmware**: EDK2025-3C6000-7A2000_AC612A0_Rc2502pre0313
- **Kernel**: https://lore.kernel.org/all/20250327095334.3327111-3-chenhuacai@loongson.cn/
- **GPU**: AMD Navi 48 [RX 9070/9070 XT]
- **Result**: `glmark2` score 10893 

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Tested-by: Dongyan Qian <qiandongyan at loongson.cn>

Best Regards,  
Dongyan Qian