Allow optional algorithms in StandardNames.

Stop-gap solution for b/228439922 to allow algorithms to be
marked as optional, i.e. only included in the full set of
expected algorithms if actually present.

(cherry picked from commit d6679aa3454a120a90bc0b8a4189080bf9606368)

Bug: 228439922
Test: atest ProviderTest
Change-Id: Ic541380f2b0e6818769a5583a91e014963004447
Merged-In: Ic541380f2b0e6818769a5583a91e014963004447
1 file changed