lima: use individual tile heap for each GP job.

lima: use individual tile heap for each GP job.

Looks like it's somehow used by subsequent PP job, so we have to
preserve its contents until PP job is done.

Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
Reviewed-by: Qiang Yu <yuq825@gmail.com>
Tested-by: Icenowy Zheng <icenowy@aosc.io>