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/ekf2/EKF/estimator_interface.h

@@ -43,6 +43,7 @@
 #define EKF_ESTIMATOR_INTERFACE_H
 
 #if defined(MODULE_NAME)
+#include <px4_platform_common/log.h>
 # define ECL_INFO PX4_DEBUG
 # define ECL_WARN PX4_DEBUG
 # define ECL_ERR  PX4_DEBUG