CDD: Add requirements for the Android Keystore System

REQUIRE hardware-backed keystore implemenations for devices with
a secure lock screen implementation and capable hardware.

REQUIRE keystore implementations to not limit the number
of keys.

REQUIRE rate-limiting the lock screen authentication attempts and
hardware-backed authentication to support base-line security of
authentication-bound keys.

Bug: 19359718
Bug: 22196335

Change-Id: Ib937d0fec43f0dd825a243552d4d2599b7ca8708
1 file changed