v0.0.0-6661-g9dfd0b42e

[XLS] Enable internal FIFO materialization for several examples

We currently require an external FIFO definition by default, and these targets only passed due to not requiring a definition for depth-0 FIFOs before commit 4b262b0de9775fd254dd99f14b4d2458021b8259

We're planning to land a more batteries-included solution soon.

PiperOrigin-RevId: 711868494