drm/amd/display: Fix annotations for dc state functions

This patch addresses inconsistencies in the annotations for the
following functions:

- **dc_get_power_profile_for_dc_state**: Standardized parameter and
  return value annotations.
- **dc_get_det_buffer_size_from_state**: Clarified parameter
  documentation for better understanding.
- **dc_get_host_router_index**: Corrected parameter descriptions to
  follow documentation conventions.

Fixes the below:
drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc.c:6386: warning: Cannot understand  ***************

Cc: Tom Chung <chiahsuan.chung@amd.com>
Cc: Roman Li <roman.li@amd.com>
Cc: Alex Hung <alex.hung@amd.com>
Cc: Aurabindo Pillai <aurabindo.pillai@amd.com>
Cc: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com>
Reviewed-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>