Fixes for enabling correct DEF generation. #370
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Fixed the gpio_signal_buffering layout to change "vccd9" and "vssd9" labels to "vccd" and "vssd", which was missed earlier. No impact other than how DEF gets written. Also: Fixed the script "chip_io_prep.sh", which needed to call out the names of the power supplies so that they would be written as SPECIALNETS in DEF, and also to expand the top level cell before flattening, without which routing subcell layouts won't get flattened.
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Fixed the gpio_signal_buffering layout to change "vccd9" and "vssd9" labels to "vccd" and "vssd", which was missed earlier. No impact other than how DEF gets written. Also: Fixed the script "chip_io_prep.sh", which needed to call out the names of the power supplies so that they would be written as SPECIALNETS in DEF, and also to expand the top level cell before flattening, without which routing subcell layouts won't get flattened.