Remove some remaining references to OBX

Remove some remaining references to OBX

Android implements the Object Push Profile in java
against RFCOMM sockets with its own implementation of
OBX there.

OBX in Bluedroid isn't compiled, and is missing header files required
to compile it anyway. Removed a number of OBX related headers and updated
a few references where they were used out of place.

Change-Id: Ifaecfb6f85b1dca9055932886af484b6dc107fc1