securetty: update to add ttySC for sh4

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

fs/skeleton/etc/securetty

@@ -40,3 +40,5 @@ ttyO3
 ttyAM0
 ttyAM1
 ttyAM2
+ttySC0
+ttySC1