Fix the name of nwell and rdl generic resistors.

Convert `mrnw` to `sky130_fd_pr__res_generic_nw`.
Convert `mrrdl` to `sky130_fd_pr__res_generic_r1`.

Fixes https://github.com/google/skywater-pdk/issues/168

Signed-off-by: Tim 'mithro' Ansell <tansell@google.com>
tree: 1a51154aae40f6ddf2e08e444b5fc1b968512f81
  1. LICENSE
  2. README.rst
  3. cells/
  4. models/
  5. tech/