drm/amd/powerplay: Move fallthrough; into containing #ifdef/#endif

The automated conversion of /* fallthrough */ comments converted
a comment outside of an #ifdef/#endif case block that should be
inside the block.

Move the fallthrough inside the block to silence the warning.
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c

@@ -3702,8 +3702,8 @@ static int smu7_request_link_speed_change_before_state_change(
 		case PP_PCIEGen2:
 			if (0 == amdgpu_acpi_pcie_performance_request(hwmgr->adev, PCIE_PERF_REQ_GEN2, false))
 				break;
-#endif
 			fallthrough;
+#endif
 		default:
 			data->force_pcie_gen = smu7_get_current_pcie_speed(hwmgr);
 			break;