Merge "Use libgtest_prod_headers." am: 7749ef2a4a am: fc3c4d6cb4 am: 09df2e2c96

Original change: https://android-review.googlesource.com/c/platform/hardware/libhardware/+/1687225

Change-Id: I19e5fa41a24414e66153b8cf868c04f97983f330