drm/nouveau: include drm/drm_edid.h only where needed

Including drm_edid.h from nouveau_connector.h causes the rebuild of 15
files when drm_edid.h is modified, while there are only a few files that
actually need to include drm_edid.h.

Cc: Karol Herbst <kherbst@redhat.com>
Cc: Lyude Paul <lyude@redhat.com>
Cc: Danilo Krummrich <dakr@redhat.com>
Cc: nouveau@lists.freedesktop.org
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Reviewed-by: Danilo Krummrich <dakr@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240104201632.1100753-1-jani.nikula@intel.com

drivers/gpu/drm/nouveau/dispnv50/head.c

@@ -32,6 +32,7 @@
 
 #include <drm/drm_atomic.h>
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_edid.h>
 #include <drm/drm_vblank.h>
 #include "nouveau_connector.h"
 

drivers/gpu/drm/nouveau/nouveau_connector.h

@@ -35,7 +35,6 @@
 
 #include <drm/display/drm_dp_helper.h>
 #include <drm/drm_crtc.h>
-#include <drm/drm_edid.h>
 #include <drm/drm_encoder.h>
 #include <drm/drm_util.h>
 
@@ -44,6 +43,7 @@
 
 struct nvkm_i2c_port;
 struct dcb_output;
+struct edid;
 
 #ifdef CONFIG_DRM_NOUVEAU_BACKLIGHT
 struct nouveau_backlight {