vendor._gowin: fix clock name quotes for Gowin IDE #3518

Job	Run time
check-links	12m 41s
document	43s
smoke (amaranth-lang/amaranth-boards)	33s
test (3.8)	2m 24s
smoke (amaranth-lang/amaranth-stdio)	36s
test (3.9)	2m 54s
smoke (amaranth-lang/amaranth-soc)	48s
test (3.10)	2m 30s
test (3.11)	2m 43s
test (3.12)	3m 34s
test (pypy-3.8)	5m 20s
test (pypy-3.9)	5m 29s
test (pypy-3.10)	4m 55s
test (3.13-dev)	3m 11s
publish-docs	12s
publish-docs-dev	0s
required	1s
publish-schemas	6s
publish-package	37s
publish-release	0s
	49m 17s

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