cutils: trace: use ANDROID_SMP to switch atomics

With inline atomics, trace functions have no non-inline function calls
in the fast (tracing off) path.  To enable this, ANDROID_SMP must be
defined for the project.  Otherwise, normal (non-inline) atomics are
used.

Change-Id: Id1f75bdf7db2f5d319a389ad411f55073d78c48c

include/cutils/trace.h

@@ -21,9 +21,14 @@
 #include <sys/types.h>
 #include <stdint.h>
 #include <unistd.h>
-#include <cutils/atomic.h>
 #include <cutils/compiler.h>
 
+#ifdef ANDROID_SMP
+#include <cutils/atomic-inline.h>
+#else
+#include <cutils/atomic.h>
+#endif
+
 __BEGIN_DECLS
 
 /**