drm/amd/display/dc/basics/conversion: Demote obvious kernel-doc abuse

Fixes the following W=1 kernel build warning(s):

 drivers/gpu/drm/amd/amdgpu/../display/dc/basics/conversion.c:86: warning: Function parameter or member 'matrix' not described in 'convert_float_matrix'
 drivers/gpu/drm/amd/amdgpu/../display/dc/basics/conversion.c:86: warning: Function parameter or member 'flt' not described in 'convert_float_matrix'
 drivers/gpu/drm/amd/amdgpu/../display/dc/basics/conversion.c:86: warning: Function parameter or member 'buffer_size' not described in 'convert_float_matrix'
 drivers/gpu/drm/amd/amdgpu/../display/dc/basics/conversion.c:86: warning: Excess function parameter 'param' description in 'convert_float_matrix'

Cc: Harry Wentland <harry.wentland@amd.com>
Cc: Leo Li <sunpeng.li@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: amd-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>