PackageManager: Add FEATURE_HARDWARE_KEYSTORE, modify FEATURE_STRONGBOX_KEYSTORE.

These feature flags will hold the KeyMint version for the default and
StrongBox HALs. They can be used by apps to convey that they'll only
work on devices which have a recent enough version of KeyMint.

For example, if an application requires ECDH to be implemented in
Secure Hardware it can convey this requirement by indicated that it
needs FEATURE_HARDWARE_KEYSTORE >= 100. Or if it needs this in the
StrongBox it can use FEATURE_STRONGBOX_KEYSTORE >= 100. As with other
feature flags, this can be used to only show the app on devices which
satisfy such requirements.

Test: Compiles
Bug: 160616951
Change-Id: I582e50fba92de0d598d7e86fcc3b1b2b4a91b103