Refactor MyDeviceInfoFragmentTest

We shadow Fragment as workaround to prevent some errors
in onCreate for fixing b/135086559.

This CL tried to not mock everything for fragment.
We need to use correct way to create fragment lifecycle,
so it can avoid some errors likes b/135086559.

Test: atest MyDeviceInfoFragmentTest
Fixes: 135086559
Change-Id: I0d650bc700f570114861081d537f83a3ba14147b