drm/amd/display/dc/dce120/dce120_hw_sequencer: Encompass defines in same clause as their use

Ideally someone should strip-out all these garbage 'if 0's.

Tempted to carry out the work myself on principle!

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

 drivers/gpu/drm/amd/amdgpu/../display/dc/dce120/dce120_hw_sequencer.c:53:47: warning: ‘reg_offsets’ defined but not used [-Wunused-const-variable=]

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: 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>

drivers/gpu/drm/amd/display/dc/dce120/dce120_hw_sequencer.c

@@ -50,6 +50,7 @@ struct dce120_hw_seq_reg_offsets {
 	uint32_t crtc;
 };
 
+#if 0
 static const struct dce120_hw_seq_reg_offsets reg_offsets[] = {
 {
 	.crtc = (mmCRTC0_CRTC_GSL_CONTROL - mmCRTC0_CRTC_GSL_CONTROL),
@@ -79,7 +80,6 @@ static const struct dce120_hw_seq_reg_offsets reg_offsets[] = {
 /*******************************************************************************
  * Private definitions
  ******************************************************************************/
-#if 0
 static void dce120_init_pte(struct dc_context *ctx, uint8_t controller_id)
 {
 	uint32_t addr;