drm/vmwgfx: Use the hotspot properties from cursor planes

jira VULN-136708
cve-bf CVE-2025-38449
commit-author Zack Rusin <zackr@vmware.com>
commit cd54994

Atomic modesetting got support for mouse hotspots via the hotspot
properties. Port the legacy kms hotspot handling to the new properties
on cursor planes.

	Signed-off-by: Zack Rusin <zackr@vmware.com>
	Cc: Maaz Mombasawala <mombasawalam@vmware.com>
	Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
	Reviewed-by: Martin Krastev <krastevm@vmware.com>
	Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231023074613.41327-4-aesteve@redhat.com
(cherry picked from commit cd54994)
	Signed-off-by: Roxana Nicolescu <rnicolescu@ciq.com>

Author: roxanan1996

drivers/gpu/drm/vmwgfx/vmwgfx_kms.c

@@ -768,13 +768,8 @@ vmw_du_cursor_plane_atomic_update(struct drm_plane *plane,
 	struct vmw_plane_state *old_vps = vmw_plane_state_to_vps(old_state);
 	s32 hotspot_x, hotspot_y;
 
-	hotspot_x = du->hotspot_x;
-	hotspot_y = du->hotspot_y;
-
-	if (new_state->fb) {
-		hotspot_x += new_state->fb->hot_x;
-		hotspot_y += new_state->fb->hot_y;
-	}
+	hotspot_x = du->hotspot_x + new_state->hotspot_x;
+	hotspot_y = du->hotspot_y + new_state->hotspot_y;
 
 	du->cursor_surface = vps->surf;
 	du->cursor_bo = vps->bo;