Meson64 Add ttyAML0 securetty

Mainline needs this

config/sources/meson64.conf

@@ -45,6 +45,8 @@ family_tweaks()
 	sed -i 's/DEVICE=.*/DEVICE="\/dev\/lirc0"/' $SDCARD/etc/lirc/hardware.conf
 	sed -i 's/LIRCD_ARGS=.*/LIRCD_ARGS="--uinput"/' $SDCARD/etc/lirc/hardware.conf
 	cp $SRC/config/lirc.conf.odroidc2 $SDCARD/etc/lirc/lircd.conf
+	echo "#Allow ttyAML0 root" >> $SDCARD/etc/securetty
+	echo "ttyAML0" >> $SDCARD/etc/securetty
 }
 
 family_tweaks_bsp()