verilog: Fixing include path.

The include lines previously had,
`include "sky130_fd_sc_hd__o221a.pp.functional.v"`
but the actual filename is
`include "sky130_fd_sc_hd__o221a.functional.pp.v"`.

Signed-off-by: Tim 'mithro' Ansell <tansell@google.com>
tree: 4389088d31bce949feca2216a305824522c91ad7
  1. cells/
  2. models/
  3. tech/
  4. timing/
  5. .gitignore
  6. LICENSE
  7. README.rst