bfqio: Include headers we use

Change-Id: I98a46e80c3a8eee46dd54c39e4e38efc4b96a559
diff --git a/libbfqio/bfqio.c b/libbfqio/bfqio.c
index e3776d5..0a4a21d 100644
--- a/libbfqio/bfqio.c
+++ b/libbfqio/bfqio.c
@@ -16,10 +16,12 @@
 
 #define LOG_TAG "bfqio"
 
+#include <errno.h>
 #include <fcntl.h>
 #include <cutils/iosched_policy.h>
 #include <log/log.h>
 #include <pthread.h>
+#include <string.h>
 #include <sys/stat.h>
 #include <unistd.h>