HIDL libs are not necessarily part of VNDK now. Because some are
used by VNDK libs, they are still VNDK. But rest are now just
vendor-available.
.hidl_for_test files are also removed because they are used to exclude
test-purpose hidl libs from VNDK libs.
Instead, .hidl_for_system_ext files are added to tests/lazy to
distinguish them from others which are installed /system.
Bug: 143933769
Test: update-makefiles.sh && m com.android.vndk.current
Change-Id: Ia81312dda340b6b5cbdd7a3c21e1d323bda39a4a
b0907a6bb8