[lldb] Sink StreamFile into lldbHost

StreamFile subclasses Stream (from lldbUtility) and is backed by a File
(from lldbHost). It does not depend on anything from lldbCore or any of its
sibling libraries, so I think it makes sense for this to live in
lldbHost instead.

Differential Revision: https://reviews.llvm.org/D157460

lldb/source/API/SBProcess.cpp

@@ -17,8 +17,8 @@
 #include "lldb/Core/Debugger.h"
 #include "lldb/Core/Module.h"
 #include "lldb/Core/PluginManager.h"
-#include "lldb/Core/StreamFile.h"
 #include "lldb/Core/StructuredDataImpl.h"
+#include "lldb/Host/StreamFile.h"
 #include "lldb/Target/MemoryRegionInfo.h"
 #include "lldb/Target/Process.h"
 #include "lldb/Target/RegisterContext.h"