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/lib/parameters/usr_parameters_if.cpp

@@ -42,6 +42,7 @@
 #include <parameters/px4_parameters.hpp>
 #include <sys/boardctl.h>
 #include <px4_platform_common/defines.h>
+#include <px4_platform_common/log.h>
 
 #include "parameters_common.cpp"