drm/amdgpu: Fix defined but not used gfx9_cs_data in gfx_v9_4_3.c

gcc with W=1
In file included from drivers/gpu/drm/amd/amdgpu/gfx_v9_4_3.c:33:
drivers/gpu/drm/amd/amdgpu/clearstate_gfx9.h:939:36: warning: ‘gfx9_cs_data’ defined but not used [-Wunused-const-variable=]
  939 | static const struct cs_section_def gfx9_cs_data[] = {
      |

gfx9_cs_data is not used in gfx_v9_4_3.c, hence remove its
include in gfx_v9_4_3.c

Cc: Christian König <christian.koenig@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>