Revert "dm: free entries in pci_businfo[] when deinit"

This commit is reported to cause UOS reboot fail becasue the
pci_businfo[] only be allocated when calling pci_parse_slot
in dm initialization while UOS reboot will not allocate again.
So we can't free it here.

This reverts commit 7aaff68.

Signed-off-by: Jie Deng <jie.deng@intel.com>

Author: ssqre

devicemodel/hw/pci/core.c

@@ -1272,9 +1272,6 @@ deinit_pci(struct vmctx *ctx)
 				    func, fi);
 			}
 		}
-
-		pci_businfo[bus] = NULL;
-		free(bi);
 	}
 }