drm/i915: move modesetting output/encoder code under display/

Add a new subdirectory for display code, and start off by moving
modesetting output/encoder code. Judging by the include changes, this is
a surprisingly clean operation.

v2:
- move intel_sdvo_regs.h too
- use tabs for Makefile	file lists and sort them

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Acked-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Acked-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190613084416.6794-2-jani.nikula@intel.com

drivers/gpu/drm/i915/i915_debugfs.c

@@ -32,18 +32,19 @@
 #include <drm/drm_debugfs.h>
 #include <drm/drm_fourcc.h>
 
+#include "display/intel_dp.h"
+#include "display/intel_hdmi.h"
+
 #include "gem/i915_gem_context.h"
 #include "gt/intel_reset.h"
 
 #include "i915_debugfs.h"
 #include "i915_irq.h"
 #include "intel_csr.h"
-#include "intel_dp.h"
 #include "intel_drv.h"
 #include "intel_fbc.h"
 #include "intel_guc_submission.h"
 #include "intel_hdcp.h"
-#include "intel_hdmi.h"
 #include "intel_pm.h"
 #include "intel_psr.h"
 #include "intel_sideband.h"