java: Interrupt.java: correct usage of mraa ISR
java: Interrupt.java: correct usage of mraa ISR

Signed-off-by: Thomas Ingleby <bb80a585db4bdbe09547a7483d1a31841fd0e0e8@intel.com>

sasmita/iot-devkit-samples,Propanu/iot-devkit-samples,haoli1106/IOT,sasmita/iot-devkit-samples,Propanu/iot-devkit-samples,haoli1106/IOT,haoli1106/IOT,Propanu/iot-devkit-samples