zynqmp: Remove dependency on arm_helpers.S

Non-Arm platforms shouldn't use Arm platform code. This patch copies the
implementation of the functions in arm_helpers.S to zynqmp_helpers.S to
remove this dependency of zynqmp on Arm platforms.

Change-Id: Ia85f303c4c63bcf0ffa57c7f3ef9d88376729b6b
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
diff --git a/plat/xilinx/zynqmp/zynqmp_private.h b/plat/xilinx/zynqmp/zynqmp_private.h
index 08a5410..d5024c3 100644
--- a/plat/xilinx/zynqmp/zynqmp_private.h
+++ b/plat/xilinx/zynqmp/zynqmp_private.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014-2016, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2014-2018, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -9,9 +9,12 @@
 
 #include <bl_common.h>
 #include <interrupt_mgmt.h>
+#include <stdint.h>
 
 void zynqmp_config_setup(void);
 
+unsigned int zynqmp_calc_core_pos(u_register_t mpidr);
+
 /* ZynqMP specific functions */
 unsigned int zynqmp_get_uart_clk(void);
 unsigned int zynqmp_get_bootmode(void);