audio_utils code cleanup

Add missing comments at end of #if
Include order
Include what you use
Fix whitespace at EOF

Test: builds OK
Change-Id: I6740fb4d6f2cb86b38a3905a82448bc982b408cc
diff --git a/audio_utils/format.c b/audio_utils/format.c
index 50872fc..c5575a0 100644
--- a/audio_utils/format.c
+++ b/audio_utils/format.c
@@ -19,8 +19,8 @@
 
 #include <log/log.h>
 
-#include <audio_utils/primitives.h>
 #include <audio_utils/format.h>
+#include <audio_utils/primitives.h>
 
 void memcpy_by_audio_format(void *dst, audio_format_t dst_format,
         const void *src, audio_format_t src_format, size_t count)