tree a7425d2662b0c0d09bac50bbae711071ae13a3a8
parent 62e313a290fe0060088911ca403534e64128702a
author xshu <xshu@google.com> 1568313108 -0700
committer xshu <xshu@google.com> 1572024670 -0700

[MAC rand] Removing persistent storage

Will now calculate the randomized MAC address directly for new wifi
networks.
For existing networks that already have saved randomized MAC address, we
will continue to use the saved MAC.

Bug: 140065828
Test: unit tests before and after factory reset
Test: Verified that new MAC address entries are not populated into
WifiConfigStore.xml
Test: Manually verified calculated MAC addresses are consistent and
valid.
Test: Manually verified that the device secret is persisted over
different builds

Change-Id: Ie216fbaf33e2582ae1a0030c5046b0d4162255d9
Merged-In: I4b4e2cc6fe304d277661c4743e4fb86bb7500f16
(cherry picked from commit I4b4e2cc6fe304d277661c4743e4fb86bb7500f16)