Revert "PowerManagerServiceTest: Set dreams as supported & enabled by default"

This reverts commit ff048914.

Reason for revert: Potential culprit for b/295891490 - verifying through ABTD before revert submission. This is part of the standard investigation process, and does not mean your CL will be reverted.

Change-Id: I04c180e342e91c0e812ee8fee6a43b70e6235679