Update xdma_mod.c

build on CentOS 8.3 will generate error:

XDMA/linux-kernel/xdma/xdma_mod.c:301:2: error: implicit declaration of function ??pci_cleanup_aer_uncorrect_error_status?? [-Werror=implicit-function-declaration]
  pci_cleanup_aer_uncorrect_error_status(pdev);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors
make[2]: *** [scripts/Makefile.build:316: /home/ndam/Downloads/dma_ip_drivers-master/XDMA/linux-kernel/xdma/xdma_mod.o] Error 1

The reason is, name change from pci_cleanup_aer_uncorrect_error_status() to pci_aer_clear_nonfatal_status() at https://github.com/torvalds/linux/commit/894020fdd88c1e9a74c60b67c0f19f1c7696ba2f

CentOS and RedHat 8.3 accepted the patch.