drm/i915: rename intel_drv.h to display/intel_display_types.h

Everything about the file is about display, and mostly about types
related to display. Move under display/ as intel_display_types.h to
reflect the facts.

There's still plenty to clean up, but start off with moving the file
where it logically belongs and naming according to contents.

v2: fix the include guard name in the renamed file

Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190806113933.11799-1-jani.nikula@intel.com

drivers/gpu/drm/i915/i915_suspend.c

@@ -26,11 +26,11 @@
 
 #include <drm/i915_drm.h>
 
+#include "display/intel_display_types.h"
 #include "display/intel_fbc.h"
 #include "display/intel_gmbus.h"
 
 #include "i915_reg.h"
-#include "intel_drv.h"
 
 static void i915_save_display(struct drm_i915_private *dev_priv)
 {