process: Switch to common cutils sched_policy api

Signed-off-by: San Mehat <san@google.com>
diff --git a/include/utils/threads.h b/include/utils/threads.h
index f5304f7..0fc533f 100644
--- a/include/utils/threads.h
+++ b/include/utils/threads.h
@@ -90,11 +90,6 @@
     ANDROID_TGROUP_MAX              = ANDROID_TGROUP_FG_BOOST,
 };
 
-typedef enum {
-    SP_BACKGROUND = 0,
-    SP_FOREGROUND = 1,
-} SchedPolicy;
-
 // Create and run a new thread.
 extern int androidCreateThread(android_thread_func_t, void *);