vendor._gowin: fix clock name quotes for Gowin IDE #3519

Job	Run time
document	47s
smoke (amaranth-lang/amaranth-boards)	39s
test (3.8)	2m 34s
smoke (amaranth-lang/amaranth-stdio)	45s
check-links	46s
smoke (amaranth-lang/amaranth-soc)	37s
test (3.9)	2m 24s
test (3.10)	2m 23s
test (3.11)	3m 4s
test (3.12)	3m 40s
test (pypy-3.8)	5m 28s
test (pypy-3.9)	5m 2s
test (pypy-3.10)	5m 5s
test (3.13-dev)	3m 20s
publish-docs	6s
publish-docs-dev	0s
required	1s
publish-schemas	5s
publish-package	47s
publish-release	0s
	37m 33s

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