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

 drivers/gpu/drm/radeon/trinity_dpm.c:146:18: warning: ‘trinity_sysls_default’ defined but not used [-Wunused-const-variable=]
 drivers/gpu/drm/radeon/trinity_dpm.c:131:18: warning: ‘trinity_mgcg_shls_disable’ defined but not used [-Wunused-const-variable=]
 drivers/gpu/drm/radeon/trinity_dpm.c:120:18: warning: ‘trinity_mgcg_shls_enable’ defined but not used [-Wunused-const-variable=]

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>