drm/amd/pm: refactor user PPT policy save and restore

The existing user policy representation has three ambiguities:

- A numeric value cannot distinguish explicit zero from an unset policy.
- One value per controller cannot preserve independent AC and DC requests.
- Suspend-only restore misses runtime resume, GPU reset, and table reload.

Refactor policy storage and restore as follows:

- Store values and validity masks by power source and PPT controller.
- Save writes against the active source.
- Restore the active source after default SMU setup.
- Reapply the target policy after live AC/DC transitions.
- Use the target source default when no explicit request exists.

The late-init path now covers system resume, runtime resume, GPU reset,
and custom PPTable reload. Common code owns persistent policy; PMFW
continues to own effective current limits.

Signed-off-by: Yang Wang <kevinyang.wang@amd.com>
Reviewed-by: Kenneth Feng <kenneth.feng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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