Revert "[Zion][Yellowstone] First pass at adding PCI ioport access."

This reverts commit b677633248.

zion/CMakeLists.txt

@@ -30,7 +30,6 @@ add_executable(zion
   object/ipc_object.cpp
   object/memory_object.cpp
   object/mutex.cpp
-  object/pci_port.cpp
   object/port.cpp
   object/process.cpp
   object/reply_port.cpp
@@ -46,7 +45,6 @@ add_executable(zion
   syscall/debug.cpp
   syscall/ipc.cpp
   syscall/memory_object.cpp
-  syscall/pci.cpp
   syscall/process.cpp
   syscall/synchronization.cpp
   syscall/syscall.cpp