build: add -Wdeclaration-after-statement
build: add -Wdeclaration-after-statement

Change-Id: Id4f25cf70c39543ae0ff250b3ab3bf7cc17f0811
Signed-off-by: Johannes Berg <bff32994ff0f8d048f262a8388145a71b6071bfe@intel.com>

greearb/iw-ct,greearb/iw-ct