chore(cpufeat): remove PAuth presence checks

TF-A operates a policy that features must be correctly configured per
each platform. There is a tool to assist in making sure that this is the
case - FEATURE_DETECTION. So performing these checks in common code is
not the right place for this. Remove them and rely on FEATURE_DETECTION.

Change-Id: If3c25dcd7bc880f1f085bc6bb5270d8d1c4caf43
Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>
diff --git a/bl31/bl31_main.c b/bl31/bl31_main.c
index 0cd0c79..5944b91 100644
--- a/bl31/bl31_main.c
+++ b/bl31/bl31_main.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013-2024, Arm Limited and Contributors. All rights reserved.
+ * Copyright (c) 2013-2025, Arm Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -104,14 +104,6 @@
 	/* Perform late platform-specific setup */
 	bl31_plat_arch_setup();
 
-#if CTX_INCLUDE_PAUTH_REGS
-	/*
-	 * Assert that the ARMv8.3-PAuth registers are present or an access
-	 * fault will be triggered when they are being saved or restored.
-	 */
-	assert(is_armv8_3_pauth_present());
-#endif /* CTX_INCLUDE_PAUTH_REGS */
-
 	/* Prints context_memory allocated for all the security states */
 	report_ctx_memory_usage();
 }