Currently host driver processes radio stats events with
scheduler thread without any lock and invokes hdd callback.
In hdd these stats gets handled in user space thread and after
processing stats, user space thread frees the memory allocated
in wma. Since one thread allocates the memory and other
thread frees the memory, this can lead to race conditions where
this memory might not get freed and mem leak can happen.
With this change add locking mechanism to allocate, use and to
free the memory.
Change-Id: I95906133bb2208a258c5cec16f4f01b1321ed0c2
CRs-Fixed: 3020218
8215f877a9