Add template parameters to MQDescriptor

First parameter is used to determine the type of the payload, and the
second parameter is used to determine the type of queue.
Added two types to be use in that second parameter.
SynchronizedReadWrite and UnsynchronizedWrite.

Test: atest fmq_unit_tests fmq_test
Bug: 142326204

Change-Id: If736389ebecd02b87879850714606523e5145579