HAL interface libs for testing are now built as test lib

The HAL interfaces for testing were copied to /system/lib[64]/vndk
directory since they are built as cc_library and thus falsely recognized
as members of VNDK, which isn't true.

Build them as cc_test_library so that they are filtered out. To do so,
.hidl_for_test files are added for the test HALs and update-makefiles.sh
were ran.

Bug: 64776708
Test: no android.hardware.tests.*.so file in /system/lib[64]/vndk on
2017 pixel devices

Change-Id: I5314db6cc08a43bccfc4521d4b80b614a91e7e48