drm/amd/display: Add KUnit tests for amdgpu_dm_pp_smu

Add comprehensive KUnit test coverage for amdgpu_dm_pp_smu.c including:
- Utility functions: dc_to_pp_clock_type, pp_to_dc_clock_levels,
  build_pm_display_cfg, get_default_clock_levels,
  build_wm_clock_ranges_soc15, cap_clock_levels_to_validation
- DPM-backed functions: dm_pp_get_clock_levels_by_type,
  dm_pp_notify_wm_clock_changes, dm_pp_apply_clock_for_voltage_request,
  dm_pp_get_static_clocks
- Raven pass-throughs: pp_rv_set_wm_ranges, pp_rv_set_pme_wa_enable,
  pp_rv_set_active_display_count, pp_rv_set_min_deep_sleep_dcfclk,
  pp_rv_set_hard_min_dcefclk_by_freq, pp_rv_set_hard_min_fclk_by_freq
- Navi functions: pp_nv_set_wm_ranges, pp_nv_get_maximum_sustainable_clocks,
  pp_nv_get_uclk_dpm_states, pp_nv_get_dpm_clock_table
- Renoir: pp_rn_get_dpm_clock_table
- dm_pp_get_funcs ASIC family selection

v2: squash in build fix for removed functions

Assisted-by: Copilot:Claude-Opus-4.6
Reviewed-by: Bhawanpreet Lakha <bhawanpreet.lakha@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: George Zhang <george.zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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