lib: remove uncessary #includes from headers

Only include what the header itself needs. The big fish here is
intel-gpu-tools.h. More will follow.

One ugly thing removed here is the duplicated GEN6_TD_CTL #define, one
of which was broken.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

lib/intel_chipset.h

@@ -28,7 +28,6 @@
 #ifndef _INTEL_CHIPSET_H
 #define _INTEL_CHIPSET_H
 
-#include <sys/types.h>
 #include <pciaccess.h>
 
 struct pci_device *intel_get_pci_device(void);
@@ -36,6 +35,7 @@ uint32_t intel_get_drm_devid(int fd);
 int intel_gen(uint32_t devid);
 
 extern enum pch_type intel_pch;
+
 enum pch_type {
 	PCH_NONE,
 	PCH_IBX,