Improve use of dataprotect

[sashei]

Improve use of cryptographic primitives in Lockbox:

Right now, we do a lot of work to generate and verify the CryptoObject for device authentication. Rather than doing all this manually, we could leverage the Keystore class from @linuxwolf's DataProtect library to do the generation & verification for us.

• [x] Confirm using latest dataprotect library, and in SecurePreferences
• [x] Use a libdataprotect Keystore for fingerprint manager work
• [x] Define labels in constants class/resource file
• [x] Extend FingerprintStore tests for remaining methods

[linuxwolf]

Requires mozilla-mobile/android-components#1206