Do not attempt to special case uncompressed font assets.

The logic to attempt to directly mmap uncompressed font assets
has resulted in breakages for some applications and utilities.
This CL disables this speculative optimzation until we can determine
the problem with this approach and if such an optimization is required.

Bug: 149780695
Test: CtsTextTestCases and androidx.appcompat.widget.AppCompatTextViewTest
Change-Id: I3b10a801a5600aefe8573fab1b28cd79c848c892