LoongArch: dts: Remove "disabled" state of clock controller node

Things like clock controllers or architectural interrupt controllers,
no one would disable them because otherwise they would have no usable
system. So we just "enabled" them by default.

Suggested-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>