[i2c] Use correct macro to determine number of i2c peripherals for id… #2

Job	Run time
Build docker containers (amd64, ha-addon)	2m 11s
Build docker containers (amd64, docker)	2m 24s
Build docker containers (amd64, lint)	2m 39s
Build docker containers (armv7, ha-addon)	8m 13s
Build docker containers (armv7, docker)	8m 26s
Build docker containers (armv7, lint)	10m 31s
Build docker containers (aarch64, ha-addon)	8m 11s
Build docker containers (aarch64, docker)	8m 17s
Build docker containers (aarch64, lint)	10m 53s
	1h 1m 45s

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