vendor._gowin: fix clock name quotes for Gowin IDE [0.5 backport] #3524

Job	Run time
check-links	47s
document	47s
test (3.8)	2m 22s
smoke (amaranth-lang/amaranth-boards)	38s
test (3.9)	2m 19s
smoke (amaranth-lang/amaranth-stdio)	36s
test (3.10)	2m 22s
smoke (amaranth-lang/amaranth-soc)	42s
test (3.11)	2m 52s
test (3.12)	3m 38s
test (pypy-3.8)	5m 23s
test (pypy-3.9)	5m 3s
test (pypy-3.10)	5m 1s
test (3.13-dev)	3m 9s
publish-docs	8s
publish-docs-dev	0s
required	1s
publish-package	39s
publish-schemas	8s
publish-release	0s
	36m 35s

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