Run BORINGSSL_self_test() in updater_main

We need to run the these tests when starting updater to verify the
statically linked libcrypto. The test function is based on the known
answer tests, and it doesn't compute the hash of the libcrypto library.

Bug: 141003171
Test: unit tests pass, run a updater on cuttlefish
Change-Id: I897918a54bca76ea0c928102e7287df27505e1cc