Removed e4crypt_create_device_key

Init was the only user of e4crypt_create_device_key and
it is not using it any more.

Bug: 36278706
Test: Removed unused code, and codebase still builds.

(cherry picked from commit d151a583479f475fcfb5d016d7d39dadec97ee72)

Change-Id: I5033dc5d315ea6be84fa9d286615c94a057dc1f0
2 files changed