Add a copy of debug policy to GSI system image

Bug: 188067818
Test: Flash RQ2A.201207.001 bramble-user with debug ramdisk & flash
  gsi_arm64-user from master, device can boot and `adb root` works
Change-Id: I37ef02628b8635e88a9e8ef917da71c8957c4be1
Merged-In: I37ef02628b8635e88a9e8ef917da71c8957c4be1
(cherry picked from commit c329a3a362bdbbc4ebe1123b1d9e835ed68a4b7d)
1 file changed