RFR: JDK-8076148 [UART] INPUT_DATA_AVAILABLE event and timeout

[Sergey Nazarkin]

issue: https://bugs.openjdk.java.net/browse/JDK-8076148
review: http://cr.openjdk.java.net/~snazarki/8076148/

Hi!

Please review the fix for dependence of UARTs INPUT_DATA_AVAILABLE event 
from timeout parameter. The changes fix also 
https://bugs.openjdk.java.net/browse/JDK-8075945

-- 
/Sergey