Remove size optimization for individual modules

It makes more sense to set the optimization flags on a platform basis
instead of individually for each module. This allows for different
optimization options for SITL, NuttX, Snapdragon, etc.

src/modules/position_estimator_inav/CMakeLists.txt

@@ -36,7 +36,7 @@ px4_add_module(
 	MAIN position_estimator_inav
 	STACK_MAIN 1200
 	STACK_MAX 4000
-	COMPILE_FLAGS -Os
+	COMPILE_FLAGS
 	SRCS
 		position_estimator_inav_main.cpp
 		position_estimator_inav_params.cpp
@@ -44,4 +44,4 @@ px4_add_module(
 	DEPENDS
 		platforms__common
 	)
-# vim: set noet ft=cmake fenc=utf-8 ff=unix : 
+# vim: set noet ft=cmake fenc=utf-8 ff=unix :