lib: unnecessary header removal for drmtest.h, part 1

Brought a few missing headers to light in ioctl_wrappers.h, too.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/tests/prime_nv_api.c b/tests/prime_nv_api.c
index e2448be..c510c1c 100644
--- a/tests/prime_nv_api.c
+++ b/tests/prime_nv_api.c
@@ -19,6 +19,7 @@
 #include "intel_gpu_tools.h"
 #include "intel_batchbuffer.h"
 #include "drmtest.h"
+#include "intel_chipset.h"
 
 #define BO_SIZE (256*1024)