Install both test variants in testcases

https://r.android.com/3462694 installed only the primary variant of
device in $PRODUCT_OUT/testcases and host in $HOST_OUT/testcases.

```
Soong only
$PRODUCT_OUT/testcases/$module/$bin
...
```

```
Make
$PRODUCT_OUT/testcases/$module/x86/$bin
...
$PRODUCT_OUT/testcases/$module/x86_64/$bin
...

This means that only the primary variant will be under test in m
--soong-only. To test both variants as well as to match make
installation rules, copy both the variants.

Config files will continue to be copied once, and they will be copied to
the arch-agnostic root $PRODUCT_OUT/testcases/$module/

Test: Set PRODUCT_SOONG_ONLY locally
Test: atest bionic-unit-tests
Test: verified that $PRODUCT_OUT/testcases/bionic-unit-tests has same no
of files as in make+soong builds
Bug: 391924360

Change-Id: I3dac751b6ea97cdfaca26ff61fb5e3cfd6e52840

0 files changed, 0 insertions, 0 deletions