Update comments for VtsHalTargetTestDefaults.

Bug: 64040096
Test: only comments added
Merged-In: I4a38aa0ed339c65aa4ffbe5c46489f27c745d5d6
Change-Id: I4a38aa0ed339c65aa4ffbe5c46489f27c745d5d6
(cherry picked from commit 1ef659eeda83c758e4f4bd0cc0f8143821d3b49c)
1 file changed