asap7: change fakerams to be more realistic

- Use 10 fin bit cell height as recommended in the ASU paper (rather than 8)
- Use banking to get more realistic ram aspect ratios
- Record the basic settings in LEF properties

Some rams like 512x8 or 2048x39 will still have a high aspect ratio as
I've limited banking to 4.

Signed-off-by: Matt Liberty <[email protected]>

Author: maliberty