perf(cpus): inline the init_cpu_data_ptr function

Similar to the reset function inline, inline this too to not do a costly
branch with no extra cost.

Change-Id: I54cc399e570e9d0f373ae13c7224d32dbdfae1e5
Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>
diff --git a/include/arch/aarch64/el3_common_macros.S b/include/arch/aarch64/el3_common_macros.S
index fd16fb5..4864596 100644
--- a/include/arch/aarch64/el3_common_macros.S
+++ b/include/arch/aarch64/el3_common_macros.S
@@ -49,7 +49,9 @@
 	 * due to a NULL TPIDR_EL3.
 	 * ---------------------------------------------------------------------
 	 */
-	bl	init_cpu_data_ptr
+	bl	plat_my_core_pos
+	bl	_cpu_data_by_index
+	msr	tpidr_el3, x0
 #endif /* IMAGE_BL31 */
 
 	/* ---------------------------------------------------------------------
diff --git a/include/lib/el3_runtime/cpu_data.h b/include/lib/el3_runtime/cpu_data.h
index 8b54806..e417f45 100644
--- a/include/lib/el3_runtime/cpu_data.h
+++ b/include/lib/el3_runtime/cpu_data.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014-2024, Arm Limited and Contributors. All rights reserved.
+ * Copyright (c) 2014-2025, Arm Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -230,7 +230,6 @@
  * APIs for initialising and accessing per-cpu data
  *************************************************************************/
 
-void init_cpu_data_ptr(void);
 void init_cpu_ops(void);
 
 #define get_cpu_data(_m)		   _cpu_data()->_m