Add environment flag to disable gcov path config.

In some cases (sp-hals), the test process must specify a different output
directory for gcov data than a pid-based one. Add an additional
environment variable that overrides the gcov prefix configuration in
HidlInternal.

Test: run vts-hal VtsHalGraphicsMapperV2_0Target
Bug: 69316065
Change-Id: I86554430f0dc400150fb3ba03400b8a13d645e53
1 file changed