poplar: Use new console APIs

Switch to the new console APIs enabled by setting MULTI_CONSOLE_API=1.
Enables building with ERROR_DEPRECATED=1.

Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
diff --git a/plat/hisilicon/poplar/platform.mk b/plat/hisilicon/poplar/platform.mk
index de262ad..0aaa707 100644
--- a/plat/hisilicon/poplar/platform.mk
+++ b/plat/hisilicon/poplar/platform.mk
@@ -46,7 +46,7 @@
 ERRATA_A53_835769		:= 1
 ERRATA_A53_843419		:= 1
 ENABLE_SVE_FOR_NS		:= 0
-
+MULTI_CONSOLE_API		:= 1
 WORKAROUND_CVE_2017_5715	:= 0
 
 PLAT_PL061_MAX_GPIOS 		:= 104