RESTRICT AUTOMERGE Delete keystore keys from RecoveryService.rebootRecoveryWithCommand()

Adds deleteSecrets() to RecoverySystemService. This method is called
from rebootRecoveryWithCommand () before the --wipe_data command is
passed to recovery and the device is force-rebooted.

deleteSecerts() calls IKeystoreMaintenance.deleteAllKeys() in order to
quickly destroy the keys protecting the synthetic password blobs
used to derive FBE encryption keys.

The intent is to make FBE-encrypted data unrecoverable even if the full
data wipe in recovery is interrupted or skipped.

Bug: 324321147
Test: Manual - System -> Reset options -> Erase all data.
Test: Hold VolDown key to interrupt reboot and stop at bootloader
screen.
Test: fastboot oem bcd wipe command && fastboot oem bcd wipe recovery
Test: fastboot reboot
Test: Device reboots into recovery and prompts to factory reset:
Test: 'Cannot load Android system. Your data may be corrupt. ...'
(cherry picked from https://android-review.googlesource.com/q/commit:0d00031851e9f5d8ef93947205a7e8b5257f0d8d)
Ignore-AOSP-First: Security fix backport
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:9cdf9eae2e02a6c3651379c33c4655368b009d13)
Merged-In: I5eb8e97f3ae1a18d5e7e7c2c7eca048ebff3440a
Change-Id: I5eb8e97f3ae1a18d5e7e7c2c7eca048ebff3440a