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/rendercopy_gen7.c

@@ -18,6 +18,7 @@
 #include "intel_gpu_tools.h"
 #include "rendercopy.h"
 #include "gen7_render.h"
+#include "intel_reg.h"
 
 #define ALIGN(x, y) (((x) + (y)-1) & ~((y)-1))