vc4: Keep sample mask writes from being reordered after TLB writes

Fixes a regression I noticed after introducing scheduling on the QIR.

Cc: "11.1" <mesa-stable@lists.freedesktop.org>

src/gallium/drivers/vc4/vc4_qpu_schedule.c

@@ -259,7 +259,8 @@ process_waddr_deps(struct schedule_state *state, struct schedule_node *n,
                 }
         } else if (is_tmu_write(waddr)) {
                 add_write_dep(state, &state->last_tmu_write, n);
-        } else if (qpu_waddr_is_tlb(waddr)) {
+        } else if (qpu_waddr_is_tlb(waddr) ||
+                   waddr == QPU_W_MS_FLAGS) {
                 add_write_dep(state, &state->last_tlb, n);
         } else {
                 switch (waddr) {