drm/drm_lease: Remove usage of deprecated DRM_DEBUG_LEASE

drm_print.h says DRM_DEBUG_LEASE is deprecated in favor of
drm_dbg_lease().

Signed-off-by: Siddh Raman Pant <code@siddh.me>
Reviewed-by: Simon Ser <contact@emersion.fr>
Signed-off-by: Simon Ser <contact@emersion.fr>
Link: https://patchwork.freedesktop.org/patch/msgid/71a443d705c62a217a3352b221b7a96c53bb1031.1673269059.git.code@siddh.me