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
2 files changed