MEM: Clean-up of Functional/Virtual/TranslatingPort remnants

This patch cleans up forward declarations and a member-function
prototype that still referred to the old FunctionalPort, VirtualPort
and TranslatingPort. There is no change in functionality.

src/kern/solaris/solaris.hh

@@ -42,8 +42,6 @@ class Solaris {};
 
 #include "kern/operatingsystem.hh"
 
-class TranslatingPort;
-
 ///
 /// This class encapsulates the types, structures, constants,
 /// functions, and syscall-number mappings specific to the Solaris