Merge "Trusty: Add persist storage folder" am: c869f2ae4b

Original change: https://android-review.googlesource.com/c/device/generic/trusty/+/2169033

Change-Id: Ib796d77a86d97834a319fd33ee7a76fac5def3c2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>