drm/amd/powerplay: drop unnecessary "@" on OD sysfs output

To follow conventional style. And this unnecessary "@" confuses
our userspace tool.
Signed-off-by: Evan Quan <evan.quan@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/powerplay/navi10_ppt.c

@@ -978,7 +978,7 @@ static int navi10_print_clk_levels(struct smu_context *smu,
 			default:
 				break;
 			}
-			size += sprintf(buf + size, "%d: %uMHz @ %umV\n", i, curve_settings[0], curve_settings[1] / NAVI10_VOLTAGE_SCALE);
+			size += sprintf(buf + size, "%d: %uMHz %umV\n", i, curve_settings[0], curve_settings[1] / NAVI10_VOLTAGE_SCALE);
 		}
 		break;
 	case SMU_OD_RANGE: