!897 LoongArch: improve dma ops and interrupt process

Merge Pull Request from: @Hongchen_Zhang 
 
1. Add swiotlb backups buffer
2. Add ARCH_HAS_SETUP_DMA_OPS and DMA_OPS
3. pci: irq: Add early_param pci_irq_limit to limit pci irq numbers 
 
Link:https://gitee.com/openeuler/kernel/pulls/897

 

Reviewed-by: Guo Dongtai <guodongtai@kylinos.cn>
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>