i2c: i2c-isch: fix spelling mistake "unitialized" -> "uninitialized"

Trivial fix to spelling mistake in dev_notice message.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>