[M61] system_api: Add MigrateToDircryptoEx to cryptohome API

Add method MigrateToDircryptoEx to cryptohome API.

BUG=chromium:747907
TEST=none

Change-Id: Ide6f8d6dec9b70079abcfed25494edeee4f56ea3
Reviewed-on: https://chromium-review.googlesource.com/632476
Commit-Ready: Pavol Marko <pmarko@chromium.org>
Tested-by: Pavol Marko <pmarko@chromium.org>
Reviewed-by: Ryo Hashimoto <hashimoto@chromium.org>
(cherry picked from commit 27810c6ba2d3f136811e516fe07d5562704a92ee)
Reviewed-on: https://chromium-review.googlesource.com/647753
Reviewed-by: Dan Erat <derat@chromium.org>
Commit-Queue: Pavol Marko <pmarko@chromium.org>
2 files changed