RFR: [dio-25] Support 64 bits platforms

[Sergey Nazarkin]

Hi!

please review modification [1]  that adds 64 bits systems support.  This update breaks compatibility with JavaME binaries if any exists, though API is unchanged so no application should be affected. 

I perform only rough tests with GPIO and UART, and would appreciate if someone test SPI and I2C. 


[1] http://cr.openjdk.java.net/~snazarki/dio-25/
[2] https://bugs.openjdk.java.net/browse/DIO-25

Sergey Nazarkin