Fix rssi handling as one of property change event

The rssi is encoded in one byte as int8_t in the stack.
JNI code copied in high byte without proper masking.
The converting is not needed. I am removing the uncessary converting.
bug 9110215

Change-Id: I50628b3a3c0bcf4a33775c6b62e9febd35bdc78d
2 files changed