plot: fix visibility nits #966

Job	Run time
Lint Bazel files	6s
Generate configs	12s
Smoketests	17m 35s
//sram:top_mix_cts	3m 4s
tag_array_64x184_generate_abstract	3m 14s
open //sram:top_mix	3m 21s
Local flow - clean setup	5m 21s
tag_array_64x184_report	2m 19s
open tag_array_64x184	2m 6s
lb_32x128_generate_abstract	3m 49s
open L1MetadataArray	3m 37s
open subpackage:L1MetadataArray	3m 41s
lb_32x128_test_generate_abstract	2m 12s
open subpackage:tag_array_64x184	2m 7s
L1MetadataArray_generate_abstract	3m 59s
data_2048x8_generate_abstract	2m 12s
regfile_128x65_floorplan	2m 2s
subpackage:L1MetadataArray_generate_abstract	4m 2s
subpackage:tag_array_64x184_generate_abstract	2m 6s
Local flow - preinstalled orfs	5m 25s
	1h 12m 30s

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