libbinder_ndk_unit_test: fix after light install

This test assumes what is installed on CF. Fixing cases for
now, will keep bug open to de-couple the test.

Bug: 300548972
Test: libbinder_ndk_unit_test (fails w/o, passes w/)
Change-Id: I4160497c1e384b862d07071df9377ecf98b605eb