Fix race condition in thread creation

There is a race condition in thread creation in initializer list of a
class. If the thread is created in initializer list of a class, it must
be the last member variable of the class, as the thread is trying to
access some of the member variables in the thread which might not be
initialized yet.

There are two way to fix this. One is to move the thread creation to
the constructor which all member variables of the class will be
initialized by that time or need to ensure the mThread variable is the
last variable of the class and the last one in the initializer list.

Bug: 235136279
Test: build
Change-Id: Ic7322d72305b4320121aad1d7872734d2d395150