hikey960: avoid to dump message when fetch boardid

The main difference between HiKey960 v1 hardware and HiKey960 v2
hardware is on UART console.

But the function of detecting boardid dumps message before console
ready. So fix it by removing those messages.
Signed-off-by: Haojian Zhuang <haojian.zhuang@linaro.org>

plat/hisilicon/hikey960/hikey960_boardid.c

 /*
- * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -148,23 +148,19 @@ int hikey960_read_boardid(unsigned int *id)
 	/* read ADC channel0 data */
 	get_value(ADC_ADCIN0, &adcin0);
 	adcin0_remap = adcin_data_remap(adcin0);
-	INFO("[BDID]adcin0:%d adcin0_remap:%d\n", adcin0, adcin0_remap);
 	if (adcin0_remap == BOARDID_UNKNOWN)
 		return -EINVAL;
 	/* read ADC channel1 data */
 	get_value(ADC_ADCIN1, &adcin1);
 	adcin1_remap = adcin_data_remap(adcin1);
-	INFO("[BDID]adcin1:%d adcin1_remap:%d\n", adcin1, adcin1_remap);
 	if (adcin1_remap == BOARDID_UNKNOWN)
 		return -EINVAL;
 	/* read ADC channel2 data */
 	get_value(ADC_ADCIN2, &adcin2);
 	adcin2_remap = adcin_data_remap(adcin2);
-	INFO("[BDID]adcin2:%d adcin2_remap:%d\n", adcin2, adcin2_remap);
 	if (adcin2_remap == BOARDID_UNKNOWN)
 		return -EINVAL;
 	*id = BOARDID3_BASE * 1000 + (adcin2_remap * 100) +
 		(adcin1_remap * 10) + adcin0_remap;
-	INFO("[BDID]boardid: %d\n", *id);
 	return 0;
 }