drm/amdgpu: add field indicating if has PCIE atomics support

The new field in amdgpu device is used to record whether the
system has PCIE atomics support. The field can be exposed to
UMD or kfd whether PCIE atomics have supported.
Signed-off-by: Jack Xiao <Jack.Xiao@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -775,6 +775,7 @@ struct amdgpu_device {
 	struct mutex                    grbm_idx_mutex;
 	struct dev_pm_domain		vga_pm_domain;
 	bool				have_disp_power_ref;
+	bool                            have_atomics_support;
 
 	/* BIOS */
 	bool				is_atom_fw;