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/rainier.S b/lib/cpus/aarch64/rainier.S
index c770f54..ea687be 100644
--- a/lib/cpus/aarch64/rainier.S
+++ b/lib/cpus/aarch64/rainier.S
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2020-2023, Arm Limited. All rights reserved.
+ * Copyright (c) 2020-2024, Arm Limited. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -80,8 +80,6 @@
 	ret
 endfunc rainier_core_pwr_dwn
 
-errata_report_shim rainier
-
 	/* ---------------------------------------------
 	 * This function provides Rainier specific
 	 * register information for crash reporting.