panfrost: Use first_tiler to check if tiling is needed

panfrost: Use first_tiler to check if tiling is needed

If there is a preload job needing tiling, but no other jobs, then
first_tiler will be set but not tiler_dep.

Fixes faults when two depth-only (stencil is reloaded) clears are done
in a row.

panfrost ffa30000.gpu: Unhandled Page fault in AS1 at VA 0x0000000044870000
               Reason: TODO
               raw fault status: 0x49002C1
               decoded fault status: SLAVE FAULT
               exception type 0xC1: TRANSLATION_FAULT_LEVEL1
               access type 0x2: READ
               source id 0x490
panfrost ffa30000.gpu: gpu sched timeout, js=0, config=0x3301, status=0x8, head=0x608a300, tail=0x608a300, sched_job=f5b0862d

Cc: mesa-stable
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11104>