drm/i915/gvt: clean up intel_gvt.h as interface for i915 core

i915 core should only call functions and structures exposed through
intel_gvt.h. Remove internal gvt.h and i915_pvinfo.h.

Change for internal intel_gvt structure as private handler which
not requires to expose gvt internal structure for i915 core.

v2: Fix per Chris's comment
- carefully handle dev_priv->gvt assignment
- add necessary bracket for macro helper
- forward declartion struct intel_gvt
- keep free operation within same file handling alloc

v3: fix use after free and remove intel_gvt.initialized

v4: change to_gvt() to an inline

Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>

drivers/gpu/drm/i915/gvt/scheduler.c

@@ -33,10 +33,11 @@
  *
  */
 
-#include "i915_drv.h"
-
 #include <linux/kthread.h>
 
+#include "i915_drv.h"
+#include "gvt.h"
+
 #define RING_CTX_OFF(x) \
 	offsetof(struct execlist_ring_context, x)