cutils: schedpolicy: remove stray include

Signed-off-by: San Mehat <san@google.com>
diff --git a/libcutils/iosched_policy.c b/libcutils/iosched_policy.c
index 7203e51..f350f58 100644
--- a/libcutils/iosched_policy.c
+++ b/libcutils/iosched_policy.c
@@ -22,7 +22,6 @@
 #include <string.h>
 #include <errno.h>
 #include <fcntl.h>
-#include <linux/unistd.h>
 
 #ifdef HAVE_SCHED_H