plat:xilinx:zynqmp: Remove the custom crash implementation

Removing the custom crash implementation and use
plat/common/aarch64/crash_console_helpers.S.

Signed-off-by: Venkatesh Yadav Abbarapu <venkatesh.abbarapu@xilinx.com>
Change-Id: I045d42eb62bcaf7d1e18fbe9ab9fb9470e800215
diff --git a/plat/xilinx/zynqmp/platform.mk b/plat/xilinx/zynqmp/platform.mk
index 1cd168f..6e700b9 100644
--- a/plat/xilinx/zynqmp/platform.mk
+++ b/plat/xilinx/zynqmp/platform.mk
@@ -73,7 +73,8 @@
 				plat/arm/common/arm_gicv2.c			\
 				plat/common/plat_gicv2.c			\
 				plat/xilinx/common/ipi.c			\
-				plat/xilinx/zynqmp/zynqmp_ipi.c		\
+				plat/xilinx/zynqmp/zynqmp_ipi.c			\
+				plat/common/aarch64/crash_console_helpers.S	\
 				plat/xilinx/zynqmp/aarch64/zynqmp_helpers.S	\
 				plat/xilinx/zynqmp/aarch64/zynqmp_common.c