drm/i915: Move intel_init_ipc() call to i915_load_modeset_init()

IPC is a display feature, so i915_load_modeset_init() is the right
place to initialize it.

Cc: Jani Nikula <[e-mail]>
Cc: Ville Syrjälä <[e-mail]>
Signed-off-by: José Roberto de Souza <[e-mail]>
Reviewed-by: Ville Syrjälä <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/i915/i915_drv.c

···
 	/* Only enable hotplug handling once the fbdev is fully set up. */
 	intel_hpd_init(dev_priv);
 
+	intel_init_ipc(dev_priv);
+
 	return 0;
 
 cleanup_gem:
···
 		goto out_cleanup_hw;
 
 	i915_driver_register(dev_priv);
-
-	intel_init_ipc(dev_priv);
 
 	enable_rpm_wakeref_asserts(dev_priv);