vendor._gowin: fix clock name quotes for Gowin IDE #3527

Job	Run time
document	45s
check-links	43s
smoke (amaranth-lang/amaranth-boards)	36s
test (3.8)	2m 24s
smoke (amaranth-lang/amaranth-stdio)	37s
test (3.9)	2m 22s
smoke (amaranth-lang/amaranth-soc)	43s
test (3.10)	2m 17s
test (3.11)	2m 44s
test (3.12)	3m 26s
test (pypy-3.8)	5m 11s
test (pypy-3.9)	4m 52s
test (pypy-3.10)	4m 49s
test (3.13-dev)	3m 7s
publish-docs	21s
publish-docs-dev	0s
required	1s
publish-schemas	4s
publish-package	45s
publish-release	10s
	35m 57s

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