Allow system_server to call ISecretKeeper.deleteAll()

This allows RecoverySystem to destroy all secretkeeper secrets before
rebooting into recovery, thus ensuring that secrets are unrecoverable
even if 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
est: Device reboots into recovery and prompts to factory reset:
Test: 'Cannot load Android system. Your data may be corrupt. ...

Change-Id: Ia0c9e4ecf839590ecbb478836efcd00bbeea5f47
diff --git a/private/system_server.te b/private/system_server.te
index 22a6238..341fa6e 100644
--- a/private/system_server.te
+++ b/private/system_server.te
@@ -333,6 +333,7 @@
 hal_client_domain(system_server, hal_rebootescrow)
 hal_client_domain(system_server, hal_remotelyprovisionedcomponent_avf)
 hal_client_domain(system_server, hal_sensors)
+hal_client_domain(system_server, hal_secretkeeper)
 hal_client_domain(system_server, hal_tetheroffload)
 hal_client_domain(system_server, hal_thermal)
 hal_client_domain(system_server, hal_threadnetwork)