Fix push paths so that required test lib is pushed

Subsets of DRM tests can now run when vendor test libs are missing, but
the widevine tests are still not running due to an issue in the push
paths.

Test: make vts && vts-tradefed run commandAndExit vts -m
VtsHalDrmV1_0Target
Bug: 64459011

Change-Id: I483fd5898e379ed6390ad74268ce9c9cbbe76223
2 files changed