change fileinputstream to filechannel

The restrict mode doesn't allow to have disk read from main thread. Some
apps enabled this check. The code in the dependencies of the
fileinputstream. This chagne switch to filechannel.

Test: presubmit
Bug: 356614910
Change-Id: Icf2175fe75ed1bfad4a048ead680b08e57d6c2ca