drm/amd/pm/powerplay/smumgr/fiji_smumgr: Demote kernel-doc format abuse

drm/amd/pm/powerplay/smumgr/fiji_smumgr: Demote kernel-doc format abuse

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

 drivers/gpu/drm/amd/amdgpu/../pm/powerplay/smumgr/fiji_smumgr.c:1107: warning: Function parameter or member 'mem_clock' not described in 'fiji_get_mclk_frequency_ratio'

Cc: Evan Quan <evan.quan@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: 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>