update asap7 std cell library version 28

[Waxpple]

1. Update asap7 std cell library version 28
2. Drop don't use ICGDC cell. The LEF file of this cell is divisible by the site width in version 28. There is a known issue in the version 28 std cell library which is the SEQ_SRAM Verilog file issue. I have created a PR. See https://github.com/The-OpenROAD-Project/asap7/pull/33