drm/amd/display: Add missing parameter desc in dc_commit_streams

drm/amd/display: Add missing parameter desc in dc_commit_streams

This commit removes the lines that describe the 'streams'
and 'stream_count' parameters and adds a line to describe the 'params'
parameter, which was missing from the original comment block.

Fixes the below with gcc W=1:
drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc.c:2138: warning: Function parameter or member 'params' not described in 'dc_commit_streams'
drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc.c:2138: warning: Excess function parameter 'streams' description in 'dc_commit_streams'
drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc.c:2138: warning: Excess function parameter 'stream_count' description in 'dc_commit_streams'

Fixes: e779f4587f61 ("drm/amd/display: Add handling for DC power mode")
Cc: Joshua Aberback <joshua.aberback@amd.com>
Cc: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Cc: Roman Li <roman.li@amd.com>
Cc: Aurabindo Pillai <aurabindo.pillai@amd.com>
Cc: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com>
Reviewed-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>