vendor._gowin: fix clock name quotes for Gowin IDE #3522

Job	Run time
check-links	47s
document	49s
smoke (amaranth-lang/amaranth-boards)	37s
smoke (amaranth-lang/amaranth-stdio)	42s
test (3.8)	2m 46s
smoke (amaranth-lang/amaranth-soc)	42s
test (3.9)	2m 26s
test (3.10)	2m 44s
test (3.11)	2m 52s
test (3.12)	3m 38s
test (pypy-3.8)	5m 13s
test (pypy-3.9)	4m 50s
test (pypy-3.10)	4m 53s
test (3.13-dev)	3m 14s
publish-docs	9s
publish-docs-dev	0s
required	1s
publish-schemas	5s
publish-package	41s
publish-release	0s
	37m 9s

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