drm/lima: Use drm_sched_job_add_syncobj_dependency()

As lima_gem_add_deps() performs the same steps as
drm_sched_job_add_syncobj_dependency(), replace the open-coded
implementation in Lima in order to simply use the DRM function.

Signed-off-by: Maíra Canal <mcanal@igalia.com>
Reviewed-by: Qiang Yu <yuq825@gmail.com>
Signed-off-by: Maíra Canal <mairacanal@riseup.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20230224214133.411966-1-mcanal@igalia.com