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_helpers.S b/plat/common/aarch64/platform_helpers.S
index b5788fb..b8fd3a2 100644
--- a/plat/common/aarch64/platform_helpers.S
+++ b/plat/common/aarch64/platform_helpers.S
@@ -1,5 +1,5 @@
 /*
- * 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
 
 	/* -----------------------------------------------------