[System.Core] Add a couple of System.IO.Pipes classes to the mobile profiles

These are required for netstandard parity.

mcs/class/System.Core/common_System.Core.dll.sources

@@ -21,10 +21,15 @@ System.IO.Pipes/AnonymousPipeClientStream.cs
 System.IO.Pipes/AnonymousPipeServerStream.cs
 System.IO.Pipes/NamedPipeClientStream.cs
 System.IO.Pipes/NamedPipeServerStream.cs
+System.IO.Pipes/PipeAccessRights.cs
+System.IO.Pipes/PipeAccessRule.cs
+System.IO.Pipes/PipeAuditRule.cs
 System.IO.Pipes/PipeDirection.cs
 System.IO.Pipes/PipeInterfaces.cs
 System.IO.Pipes/PipeOptions.cs
+System.IO.Pipes/PipeSecurity.cs
 System.IO.Pipes/PipeStream.cs
+System.IO.Pipes/PipeStreamImpersonationWorker.cs
 System.IO.Pipes/PipeTransmissionMode.cs
 
 ReferenceSources/SR.cs

mcs/class/System.Core/net_4_x_System.Core.dll.sources

@@ -1,11 +1,6 @@
 #include common_System.Core.dll.sources
 #include dynamic_System.Core.dll.sources
 
-System.IO.Pipes/PipeAccessRights.cs
-System.IO.Pipes/PipeAccessRule.cs
-System.IO.Pipes/PipeAuditRule.cs
-System.IO.Pipes/PipeSecurity.cs
-System.IO.Pipes/PipeStreamImpersonationWorker.cs
 System.IO.Pipes/PipeUnix.cs
 System.IO.Pipes/PipeWin32.cs