drm/amd/pm/smu15: switch SMU v15.0.0 to DRAM-based accumulator metrics

Replace the legacy SMU table-copy metrics path with a DRAM-mapped,
accumulator-based approach for SMU v15.0.0, using a ping-pong buffer
to compute averaged metrics from deltas between consecutive samples.

- Add GetMetricsTableVersion, GetMetricsTableLogSample and
  GetMetricsTableLogDramAddr messages and their MSG_MAP entries.
- Introduce SMU_15_0_0_MetricsInfo_t holding two MetricsTable_t
  buffers, the mapped DRAM address, table size and pre-computed
  avg_metric[] values.
- Resolve and ioremap_wc() the firmware log DRAM address once in
  init_smc_tables(); iounmap() it in fini_smc_tables().
- Fetch samples into the inactive buffer, compute averaged clocks,
  activity, power and temperature via wrapping_sub() accumulator
  deltas, then swap the active index.
- Rename the old get_metrics_table() to get_gpu_metrics_table() for
  the gpu_metrics v3.0 export path.
- Smartshift sensor reporting is dropped

Co-developed-by: Pratik Vishwakarma <Pratik.Vishwakarma@amd.com>
Signed-off-by: Pratik Vishwakarma <Pratik.Vishwakarma@amd.com>
Co-developed-by: Suresh Guttula <Suresh.Guttula@amd.com>
Signed-off-by: Suresh Guttula <Suresh.Guttula@amd.com>
Co-developed-by: Kanala Ramalingeswara Reddy <Kanala.RamalingeswaraReddy@amd.com>
Signed-off-by: Kanala Ramalingeswara Reddy <Kanala.RamalingeswaraReddy@amd.com>
Signed-off-by: Shubhankar Milind Sardeshpande <Shubhankar.MilindSardeshpande@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Acked-by: Yang Wang <kevinyang.wang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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