etc/securetty: Add ttyO0 to ttyO3 for omap

Recent kernels (2.6.37*) use a different name for OMAP serial ports.
They are no longer called ttySx but ttyOx.

Signed-off-by: Guillaume GARDET <guillaume.gardet@free.fr>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

fs/skeleton/etc/securetty

@@ -33,3 +33,7 @@ ttyCPM3
 ttymxc0
 ttymxc1
 ttymxc2
+ttyO0
+ttyO1
+ttyO2
+ttyO3