Provide fallback for keymaster implementations

Some implementations won't support ECDSA or DSA, so provide a fallback
for them by using the softkeymaster implementation. This will allow us
to universally support ECDSA and DSA on all platforms regardless of HAL
version.

Bug: 10600582
Change-Id: Ib842816cc1415ec00abb7d22c8e9b6bbe58f6a86
8 files changed
tree: f3f8b5bfe97d7cf26dad40f32487e58f4e3e2c8f
  1. keystore/
  2. keystore-engine/
  3. softkeymaster/