Update unit-test paths for Widevine nativetests.

Recently a change was made to move our tests from /data/bin/<test> to
/data/nativetest/<test> in the <device>-tests.zip. Need to reflect that
change in the tests that run on ATP.

Test: google/template/asit --template:map test=google/test/framework/media/widevine/tests/widevine-cdm-engine

Bug: 128256706
Change-Id: I1337ee6a62555d68a6325a26953fb5732e4de966
34 files changed