[YXI] YXI Generated AXI Wrapper Only Works With Memories of Width 32b

[andrewb1999]

The wrapper that YXI generates fails for any memory element bitwidth other than 32. If this is a requirement for how the AXI communication works currently it should insert slices to ensure the bitwidth matches that of the memory reference used in the main component. At a minimum, yxi should error out if a memory ref does not have a bitwidth of 32, but that would be less ideal.