refactor(cpus): remove cpu specific errata funcs

Errata printing is done directly via generic_errata_report.
This commit removes the unused \_cpu\()_errata_report
functions for all cores, and removes errata_func from cpu_ops.

Change-Id: I04fefbde5f0ff63b1f1cd17c864557a14070d68c
Signed-off-by: Ryan Everett <ryan.everett@arm.com>
diff --git a/lib/cpus/aarch64/aem_generic.S b/lib/cpus/aarch64/aem_generic.S
index d47279a..d5634cf 100644
--- a/lib/cpus/aarch64/aem_generic.S
+++ b/lib/cpus/aarch64/aem_generic.S
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014-2019, Arm Limited and Contributors. All rights reserved.
+ * Copyright (c) 2014-2024, Arm Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -74,15 +74,6 @@
 	b	dcsw_op_all
 endfunc aem_generic_cluster_pwr_dwn
 
-#if REPORT_ERRATA
-/*
- * Errata printing function for AEM. Must follow AAPCS.
- */
-func aem_generic_errata_report
-	ret
-endfunc aem_generic_errata_report
-#endif
-
 	/* ---------------------------------------------
 	 * This function provides cpu specific
 	 * register information for crash reporting.