SITL: Move back to LPE as its more robust to host timing

cmake/configs/posix_sitl_default.cmake

@@ -104,7 +104,7 @@ set(config_extra_builtin_cmds
 # for the config posix_sitl_efk2 and set again, explicitly, for posix_sitl_lpe,
 # which are based on posix_sitl_default.
 set(config_sitl_rcS_dir
-	posix-configs/SITL/init/ekf2
+	posix-configs/SITL/init/lpe
 	CACHE INTERNAL "init script dir for sitl"
 	)