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>
diff --git a/plat/common/aarch64/platform_mp_stack.S b/plat/common/aarch64/platform_mp_stack.S
index f1cc6be..972a118 100644
--- a/plat/common/aarch64/platform_mp_stack.S
+++ b/plat/common/aarch64/platform_mp_stack.S
@@ -1,5 +1,5 @@
 /*
- * 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