Remove unused function symbols

This patch removes the unused functions that are marked as .global
in code but not defined anywhere in the code.

Change-Id: Ia5057a77c0b0b4a61043eab868734cd3437304cc
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>

lib/aarch64/misc_helpers.S

@@ -18,7 +18,6 @@
 
 	.globl	zero_normalmem
 	.globl	zeromem
-	.globl	zeromem16
 	.globl	memcpy16
 
 	.globl	disable_mmu_el1

plat/common/aarch64/platform_helpers.S

 /*
- * Copyright (c) 2013-2018, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2013-2019, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -26,8 +26,6 @@
 	.weak	plat_handle_double_fault
 	.weak	plat_handle_el3_ea
 
-	.globl	platform_get_core_pos
-
 #define MPIDR_RES_BIT_MASK	0xff000000
 
 	/* -----------------------------------------------------

plat/common/aarch64/platform_mp_stack.S

 /*
- * Copyright (c) 2014-2017, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2014-2019, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -12,8 +12,6 @@
 	.local	platform_normal_stacks
 	.weak	plat_get_my_stack
 	.weak	plat_set_my_stack
-	.globl	platform_get_stack
-	.globl	platform_set_stack
 
 	/* ---------------------------------------------------------------------
 	 * When the compatility layer is disabled, the new platform APIs

plat/common/aarch64/platform_up_stack.S

 /*
- * Copyright (c) 2014-2017, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2014-2019, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -12,8 +12,6 @@
 	.local	platform_normal_stacks
 	.weak	plat_set_my_stack
 	.weak	plat_get_my_stack
-	.weak	platform_set_stack
-	.weak	platform_get_stack
 
 	/* -----------------------------------------------------
 	 * uintptr_t plat_get_my_stack ()