[nrf fromlist] dts: nordic: nrf54h20: add power domain information

So that it can be used to manually control certain power domains.

Upstream PR #: 80291

Signed-off-by: Gerard Marull-Paretas <[email protected]>
(cherry picked from commit 848666352e48799680d3fb92ffc355acccbd2a87)

Author: gmarull