rcar_gen3: console: Convert to multi-console API

Convert the R-Car Gen3 platform and both SCIF and Log drivers
to multi-console API.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Change-Id: I18556973937d150b60453f9150d54ee612571e35
diff --git a/plat/renesas/rcar/platform.mk b/plat/renesas/rcar/platform.mk
index 85cbe07..3b3ca19 100644
--- a/plat/renesas/rcar/platform.mk
+++ b/plat/renesas/rcar/platform.mk
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2018, Renesas Electronics Corporation. All rights reserved.
+# Copyright (c) 2018-2019, Renesas Electronics Corporation. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
@@ -12,6 +12,7 @@
 GENERATE_COT			:= 1
 BL2_AT_EL3			:= 1
 ENABLE_SVE_FOR_NS		:= 0
+MULTI_CONSOLE_API		:= 1
 
 CRASH_REPORTING			:= 1
 HANDLE_EA_EL3_FIRST		:= 1