m7-common: Add firmware blobs for 4.3 hardware keystore

For more information about it and a sample app to verify it, check the link below.

http://nelenkov.blogspot.com/2013/08/credential-storage-enhancements-android-43.html

https://github.com/nelenkov/android-keystore

Precompiled APK: https://www.dropbox.com/s/qjnsixdth1p7x66/android-keystore-sample.apk