feat(xilinx): add none console

None console does not register boot and runtime console.
User will not observe any console logs.

Change-Id: I39877c900f399ae7cffc1bb599b30c7a23888fc8
Signed-off-by: Michal Simek <michal.simek@amd.com>
Signed-off-by: Maheedhar Bollapalli <MaheedharSai.Bollapalli@amd.com>
diff --git a/plat/xilinx/zynqmp/platform.mk b/plat/xilinx/zynqmp/platform.mk
index d6ad49c..5a86658 100644
--- a/plat/xilinx/zynqmp/platform.mk
+++ b/plat/xilinx/zynqmp/platform.mk
@@ -111,7 +111,7 @@
 				${XLAT_TABLES_LIB_SRCS}
 
 ZYNQMP_CONSOLE	?=	cadence
-ifeq (${ZYNQMP_CONSOLE}, $(filter ${ZYNQMP_CONSOLE},cadence cadence0 cadence1 dcc dtb))
+ifeq (${ZYNQMP_CONSOLE}, $(filter ${ZYNQMP_CONSOLE},cadence cadence0 cadence1 dcc dtb none))
 else
   $(error "Please define ZYNQMP_CONSOLE")
 endif