Remove include <log.h> from defines.h

The reason for this is that log.h includes drv_hrt.h which sucks in
half the project's include files with it, which causes strange build
issues

src/modules/gimbal/input_test.cpp

@@ -34,6 +34,7 @@
 #include "input_test.h"
 
 #include <px4_platform_common/posix.h>
+#include <px4_platform_common/log.h>
 #include <lib/matrix/matrix/math.hpp>
 #include <lib/mathlib/mathlib.h>