Move PlatformFreeBSD to its own namespace

Based on r233679

llvm-svn: 241287
diff --git a/lldb/source/Initialization/SystemInitializerCommon.cpp b/lldb/source/Initialization/SystemInitializerCommon.cpp
index 716b3ff..35189c1 100644
--- a/lldb/source/Initialization/SystemInitializerCommon.cpp
+++ b/lldb/source/Initialization/SystemInitializerCommon.cpp
@@ -106,7 +106,7 @@
     ObjectFileELF::Initialize();
     ObjectFilePECOFF::Initialize();
     DynamicLoaderPOSIXDYLD::Initialize();
-    PlatformFreeBSD::Initialize();
+    platform_freebsd::PlatformFreeBSD::Initialize();
     platform_linux::PlatformLinux::Initialize();
     PlatformWindows::Initialize();
     PlatformKalimba::Initialize();
@@ -152,7 +152,7 @@
     ObjectFileELF::Terminate();
     ObjectFilePECOFF::Terminate();
     DynamicLoaderPOSIXDYLD::Terminate();
-    PlatformFreeBSD::Terminate();
+    platform_freebsd::PlatformFreeBSD::Terminate();
     platform_linux::PlatformLinux::Terminate();
     PlatformWindows::Terminate();
     PlatformKalimba::Terminate();