soc/mediatek/mt8173/dramc_pi_calibration_api.c: Use __func__

Change-Id: I461012b164bbd6f2d1162a793903aafe0b15e234
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49564
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>

src/soc/mediatek/mt8173/dramc_pi_calibration_api.c

@@ -1086,7 +1086,7 @@ void perbit_window_cal(u32 channel, u8 type)
 	}
 
 	if (fail == 1) /* error handling */
-		die("fail on perbit_window_cal()\n");
+		die("fail on %s()\n", __func__);
 
 	dramc_dbg_msg("==================================================\n");
 	dramc_dbg_msg("        dramc_perbit_window_swcal:\n");