zenfone8: Removing GSI keys

Those keys will be embedded into VtsSecurityAvb on host side
instead, to verify the GSI image used on the device.

Bug: 149806769
Test: build and checks those keys are removed from
      $OUT/recovery/root/first_stage_ramdisk/avb/
Change-Id: I8a002ba6f1421fb460056ccae6572050bdb0ce3c
1 file changed