[zion] Add a method for duplicating and scoping down VMMOs.

Use the AHCI section of the PCI config as an example POC of this.

We can now pass a memory capability instead of just the physical
address.

zion/syscall/syscall.cpp

@@ -63,6 +63,7 @@ extern "C" z_err_t SyscallHandler(uint64_t call_id, void* req) {
     CASE(MemoryObjectCreate);
     CASE(MemoryObjectCreatePhysical);
     CASE(MemoryObjectCreateContiguous);
+    CASE(MemoryObjectDuplicate);
     // syscall/ipc.h
     CASE(ChannelCreate);
     CASE(ChannelSend);