feat: refactored some pci code and added pretty print of classes

kernel/command.c

@@ -95,6 +95,10 @@ void print(const char *arg) {
         pci_print_info();
     } else if (strcmp(arg, "pci_caps") == 0) {
         pci_dump_caps();
+#ifdef ENABLE_PCIPP
+    } else if (strcmp(arg, "pcipp") == 0) {
+        pci_pretty_print();
+#endif
     } else if (strcmp(arg, "ide") == 0) {
         ide_print_devices();
     } else {