systemc: Add the deprecated sc_signal_out_if typedef.

This is needed by the regression tests.

Change-Id: I5666cf9ad445869e74edda857afd59ab7ece4f4c
Reviewed-on: https://gem5-review.googlesource.com/10955
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>

src/systemc/ext/channel/_using.hh

@@ -87,6 +87,7 @@ using sc_core::SC_ONE_WRITER;
 using sc_core::SC_MANY_WRITERS;
 using sc_core::sc_signal_write_if;
 using sc_core::sc_signal_inout_if;
+using sc_core::sc_signal_out_if;
 
 using sc_core::sc_signal_resolved;
 

src/systemc/ext/channel/sc_signal_inout_if.hh

@@ -85,6 +85,10 @@ class sc_signal_inout_if : public sc_signal_in_if<T>,
     }
 };
 
+// Deprecated.
+template <class T>
+using sc_signal_out_if = sc_signal_inout_if<T>;
+
 } // namespace sc_core
 
 #endif  //__SYSTEMC_EXT_CHANNEL_SC_SIGNAL_INOUT_IF_HH__