vendor._gowin: fix clock name quotes for Gowin IDE #3523

Job	Run time
smoke (amaranth-lang/amaranth-boards)	44s
document	45s
test (3.8)	2m 33s
smoke (amaranth-lang/amaranth-stdio)	39s
check-links	49s
test (3.9)	2m 28s
smoke (amaranth-lang/amaranth-soc)	41s
test (3.10)	2m 25s
test (3.11)	2m 46s
test (3.12)	3m 44s
test (pypy-3.8)	5m 18s
test (pypy-3.9)	5m 30s
test (pypy-3.10)	4m 59s
test (3.13-dev)	3m 11s
publish-docs	17s
publish-docs-dev	0s
required	1s
publish-package	49s
publish-schemas	14s
publish-release	0s
	37m 53s

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