Dice HAL: Add VTS Test.

This CL adds a VTS test for the DICE HAL, and a test specific for
demotion testing. Demotion testing leaves the device in a permanently
modified state untill the next reboot, which is why it needs a special
test config. The current test config restarts the device before testing,
in a followup the device also has to reboot after the test.

Bug: 198197213
Test: atest VtsAidlDiceTargetTest
      atest VtsAidlDiceDemoteTargetTest
Change-Id: I4278a1352df749da50dc8e5d118fc37336026061