arch: loongarch: configs: disable DRM_LOONGSON by default

[MingcongBai]

This module is currently not yet ready and causes boot failure on some systems. Use SYSFB_SIMPLEFB and use the EFI Framebuffer to drive the display more reliably.

[deepin-ci-robot]

deepin pr auto review

关键摘要:

• 移除了CONFIG_DRM_LOONGSON=m的配置项，需要确认是否有替代方案处理Loongson的DRM支持。

是否建议立即修改:

• 是，如果移除CONFIG_DRM_LOONGSON=m会导致Loongson的DRM支持缺失，那么需要立即修复。如果这是一个有意的更改，那么需要确保有替代的配置项或模块来提供必要的DRM支持。

[deepin-ci-robot]

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