RFR: JDK-8052182 - Need to support i2c bus numbers > 1

[Jen Dority]

issue: https://bugs.openjdk.java.net/browse/JDK-8052182
webrev: http://cr.openjdk.java.net/~jld/8052182/

Hi All,

Need a review for this change which removes an unnecessary restriction 
on i2c bus ids.

Thanks,
Jen