RFR: JDK-8048317 - GPIOLEDSample.java has the wrong package name

[Jen Dority]

issue: https://bugs.openjdk.java.net/browse/JDK-8048317
webrev: http://cr.openjdk.java.net/~jld/8048317/

Need a trivial review for a package name correction -- "samples" --> 
"sample".

Thanks,
Jen