drm/amd/amdgpu: Clean up header file of symbols that are defined to be static

[Why]
Header file exports functions get_gpu_clock_counter(), get_cu_info() and
select_se_sh() that are defined to be static
Signed-off-by: Ramesh Errabolu <Ramesh.Errabolu@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/gfx_v9_0.h

@@ -26,9 +26,4 @@
 
 extern const struct amdgpu_ip_block_version gfx_v9_0_ip_block;
 
-void gfx_v9_0_select_se_sh(struct amdgpu_device *adev, u32 se_num, u32 sh_num);
-
-uint64_t gfx_v9_0_get_gpu_clock_counter(struct amdgpu_device *adev);
-int gfx_v9_0_get_cu_info(struct amdgpu_device *adev, struct amdgpu_cu_info *cu_info);
-
 #endif