Install BoringSSL self test binaries to vendor image.

Required in order to run test self test for the vendor copy of
libcrypto.so which may differ from the one in /system and so will use
differently name flag files in order to avoid running the BoringSSL
Known Answer Tests on every process startup, impacting system health.

Bug: 141150335
Test: TH
Change-Id: I1db922379a59fa66fc65b6d92d370f33a2c65799