backend/drm: fix cursor hotspot enablement for virtualized drivers
DRM_CLIENT_CAP_CURSOR_PLANE_HOTSPOT can only be set after DRM_CLIENT_CAP_ATOMIC has been enabled.
(cherry picked from commit bd2728fa)
DRM_CLIENT_CAP_CURSOR_PLANE_HOTSPOT can only be set after DRM_CLIENT_CAP_ATOMIC has been enabled.
(cherry picked from commit bd2728fa)