qemu: remove MULTI_CONSOLE=0 to support TF-A v2.0

Adds support for Arm Trusted Firmware-A version v2.0.

The qemu platform in TF-A v2.0 does not acccept MULTI_CONSOLE=0 anymore,
so remove it. The current version v1.5 is quite happy without it already.

Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>

qemu.mk

@@ -58,7 +58,6 @@ ARM_TF_FLAGS ?= \
 	DEBUG=$(ARM_TF_DEBUG) \
 	ENABLE_ASSERTIONS=$(ARM_TF_DEBUG) \
 	LOG_LEVEL=$(ARM_TF_LOGLVL) \
-	MULTI_CONSOLE_API=0 \
 	ARM_TSP_RAM_LOCATION=tdram \
 	BL32_RAM_LOCATION=tdram \
 	AARCH32_SP=optee