selectively increase optimization -Os -> -O2

- targetted at modules/libraries that benefit without drastically
increasing flash usage
 - ignored on boards with CONSTRAINED_FLASH set

src/modules/sensors/sensor_corrections/CMakeLists.txt

@@ -35,3 +35,4 @@ px4_add_library(sensor_corrections
 	SensorCorrections.cpp
 	SensorCorrections.hpp
 )
+target_compile_options(sensor_corrections PRIVATE ${MAX_CUSTOM_OPT_LEVEL})

src/modules/sensors/vehicle_acceleration/CMakeLists.txt

@@ -35,6 +35,9 @@ px4_add_library(vehicle_acceleration
 	VehicleAcceleration.cpp
 	VehicleAcceleration.hpp
 )
+
+target_compile_options(vehicle_acceleration PRIVATE ${MAX_CUSTOM_OPT_LEVEL})
+
 target_link_libraries(vehicle_acceleration
 	PRIVATE
 		mathlib

src/modules/sensors/vehicle_angular_velocity/CMakeLists.txt

@@ -35,6 +35,9 @@ px4_add_library(vehicle_angular_velocity
 	VehicleAngularVelocity.cpp
 	VehicleAngularVelocity.hpp
 )
+
+target_compile_options(vehicle_angular_velocity PRIVATE ${MAX_CUSTOM_OPT_LEVEL})
+
 target_link_libraries(vehicle_angular_velocity
 	PRIVATE
 		mathlib

src/modules/sensors/vehicle_imu/CMakeLists.txt

@@ -37,4 +37,5 @@ px4_add_library(vehicle_imu
 	VehicleIMU.cpp
 	VehicleIMU.hpp
 )
+target_compile_options(vehicle_imu PRIVATE ${MAX_CUSTOM_OPT_LEVEL})
 target_link_libraries(vehicle_imu PRIVATE sensor_corrections px4_work_queue)