Move i2c to clash cores #2470

Job	Run time
Build and run limited tests (macOS, 8.6)	13m 27s
Build and run limited tests (macOS, 8.8)	12m 29s
Build and run limited tests (macOS, 9.0)	15m 52s
Build and run limited tests (macOS, 9.2)	9m 54s
Build and run limited tests (macOS, 9.4)	12m 7s
Build and run limited tests (windows, 8.6)	12m 58s
Build and run limited tests (windows, 8.10)	17m 13s
Build and run limited tests (windows, 9.2)	15m 28s
Build and run limited tests (windows, 9.4)	13m 38s
Build and Test	0s
All jobs finished	3s
	2h 3m 9s

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