Allow mapping the PCI Config so Yellowstone can map it.

This is a temp system call. Evemtually we should probably supply the
root process with all of the system physical memory objects.

sys/yellowstone/yellowstone.cpp

@@ -2,12 +2,16 @@
 #include <mammoth/process.h>
 #include <zcall.h>
 
+#include "hw/pcie.h"
+
 uint64_t main() {
   dbgln("Yellowstone Initializing.");
   uint64_t vaddr;
   check(ZAddressSpaceMap(Z_INIT_VMAS_SELF, 0, Z_INIT_BOOT_VMMO, &vaddr));
   check(SpawnProcessFromElfRegion(vaddr));
 
+  DumpPciEDevices();
+
   dbgln("Yellowstone Finished Successfully.");
   return 0;
 }