intel-gpu-tools: add sys/wait.h to pm_rps.c

commit 745945546f
breaks the build under Android because some of the
macros used in pm_rps.c are defined in sys/wait.h
which is not included.

Signed-off-by: Tim Gore <tim.gore@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

tests/pm_rps.c

@@ -34,6 +34,7 @@
 #include <fcntl.h>
 #include <signal.h>
 #include <errno.h>
+#include <sys/wait.h>
 
 #include "drmtest.h"
 #include "intel_io.h"