Use ro.keystore.boot_level_key.strategy

Choose the strategy for generating the boot level  key from a property,
if present, instead of looking at KM versions.

Bug: 241241178
Test: set property on Cuttlefish, check logs for strategy used.
Change-Id: I2c7a6fb2c6471ab4a7cb7f650791930f41068bfa
1 file changed