system/securetty: Add ttyPS[0-1]

Adding ttyPS0 and ttyPS1 to securetty for Zynq.

Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

system/skeleton/etc/securetty

@@ -22,6 +22,8 @@ ttyUL0
 ttyUL1
 ttyUL2
 ttyUL3
+ttyPS0
+ttyPS1
 ttyPSC0
 ttyPSC1
 ttyPSC2