yosys: simplify canonicalization invocation #944

Job	Run time
Generate configs	9s
Smoketests	17m 21s
Lint Bazel files	4s
//sram:top_mix_cts	3m 15s
tag_array_64x184_generate_abstract	3m 36s
open //sram:top_mix	3m 41s
tag_array_64x184_report	2m 24s
open tag_array_64x184	2m 14s
Local flow - clean setup	5m 42s
lb_32x128_generate_abstract	3m 47s
open L1MetadataArray	4m 1s
lb_32x128_test_generate_abstract	2m 12s
L1MetadataArray_generate_abstract	4m 13s
open subpackage:L1MetadataArray	3m 57s
data_2048x8_generate_abstract	2m 20s
open subpackage:tag_array_64x184	2m 14s
regfile_128x65_floorplan	2m 11s
subpackage:L1MetadataArray_generate_abstract	4m 15s
subpackage:tag_array_64x184_generate_abstract	2m 13s
Local flow - preinstalled orfs	5m 45s
	1h 15m 34s

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