sim: dv-sockser: push module init prototype down

Pull out the duplicated dv_sockser_install prototype from the tconfig.in
files and put it in the one place it gets used -- sim-module.c.  This is
still arguably incorrect, but it's better than the status quo where the
tconfig.in has to include header files and duplicate the dv-sockser func.
The tconfig header is meant to be simple and contain a target defines.

sim/common/sim-module.c

@@ -19,6 +19,7 @@ GNU General Public License for more details.
 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
+#include "config.h"
 #include "sim-main.h"
 #include "sim-io.h"
 #include "sim-options.h"
@@ -28,6 +29,11 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 #include "sim-hw.h"
 #endif
 
+#ifdef HAVE_DV_SOCKSER
+/* TODO: Shouldn't have device models here.  */
+#include "dv-sockser.h"
+#endif
+
 #include "libiberty.h"
 
 /* List of all modules.  */
@@ -59,6 +65,10 @@ static MODULE_INSTALL_FN * const modules[] = {
 #endif
 #if WITH_HW
   sim_hw_install,
+#endif
+#ifdef HAVE_DV_SOCKSER
+  /* TODO: Shouldn't have device models here.  */
+  dv_sockser_install,
 #endif
   /* Configured in [simulator specific] additional modules.  */
 #ifdef MODULE_LIST