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/nevis.S b/lib/cpus/aarch64/nevis.S
index 36830a9..0180ab7 100644
--- a/lib/cpus/aarch64/nevis.S
+++ b/lib/cpus/aarch64/nevis.S
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2023, Arm Limited. All rights reserved.
+ * Copyright (c) 2023-2024, Arm Limited. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -40,8 +40,6 @@
 	ret
 endfunc nevis_core_pwr_dwn
 
-errata_report_shim nevis
-
 .section .rodata.nevis_regs, "aS"
 nevis_regs: /* The ASCII list of register names to be reported */
 	.asciz	"cpuectlr_el1", ""