ECL: Add data validator group in CMake

src/lib/ecl/CMakeLists.txt

@@ -40,6 +40,8 @@ px4_add_module(
 		attitude_fw/ecl_roll_controller.cpp
 		attitude_fw/ecl_yaw_controller.cpp
 		l1/ecl_l1_pos_controller.cpp
+		validation/data_validator.cpp
+		validation/data_validator_group.cpp
 	DEPENDS
 		platforms__common
 	)