Moves libmemtrack header to standard location

Change-Id: If8c80003bc2f042c67ffdf38469407de3c2fda2c
diff --git a/libmemtrack/memtrack.c b/libmemtrack/memtrack.c
index 2b2651a..9a656df 100644
--- a/libmemtrack/memtrack.c
+++ b/libmemtrack/memtrack.c
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-#include <memtrack.h>
+#include <memtrack/memtrack.h>
 
 #define LOG_TAG "memtrack"