Fixes for parameters.xml dependencies

Moved definitions of parameters into *params.c in each module.
This is used by the cmake file as a pattern for dependencies when
generating the parameters.xml file.

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

src/modules/mavlink/CMakeLists.txt

@@ -56,6 +56,7 @@ px4_add_module(
 		mavlink_rate_limiter.cpp
 		mavlink_receiver.cpp
 		mavlink_ftp.cpp
+		mavlink_params.c
 	DEPENDS
 		platforms__common
 	)