Bluetooth: OPP: Handle Try Again exception to retry write

When the write to socket is faster than BT maximum throughput
socket buffer gets full and it returns EAGAIN, writing application
has to retry in this case. This return value is thrown as exception
from JNI layer and has to be handled properly to retry the write
operation.

Change-Id: I14db1d85a2e406cf70ae3687db8b727baaba782b