ekf2 replay: refactor to use unified rcS scripts

posix-configs/SITL/init/ekf2/iris_replay

@@ -1,13 +0,0 @@
-#!/usr/bin/bash
-# PX4 commands need the 'px4-' prefix in bash.
-# (px4-alias.sh is expected to be in the PATH)
-source px4-alias.sh
-
-uorb start
-param set SDLOG_DIRS_MAX 7
-
-ekf2 start -r
-logger start -f -t -b 1000 -p vehicle_attitude
-sleep 0.2
-replay start
-