msm8226: Load keystore during recovery and fastboot modes

Implement loading of SSD keystore function and use it for
msm8226 devices. The keystore loading will happen in
recovery mode - that makes possible recovery/update mechanism
to be used to decrypt firmware images. The function is also
used in fastboot mode for device provisioning.

Change-Id: Ifc1ca11bec0caf60a69eca168a1cd9ac797ea23b
2 files changed