efi/cper, cxl: Remove cxl_err.h

While going to create include/linux/cxl.h for some cross-subsystem CXL
definitions I noticed that include/linux/cxl_err.h was already present.
That header has no reason to be global, and it duplicates the RAS
Capability Structure definitions in drivers/cxl/cxl.h. A follow-on patch
can consider unifying the CXL native error tracing with the CPER error
printing.

Also fixed up the spec reference as the latest released spec is v3.0.

Cc: Smita Koralahalli <Smita.KoralahalliChannabasappa@amd.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>

drivers/firmware/efi/cper_cxl.c

@@ -9,7 +9,6 @@
 
 #include <linux/cper.h>
 #include "cper_cxl.h"
-#include <linux/cxl_err.h>
 
 #define PROT_ERR_VALID_AGENT_TYPE		BIT_ULL(0)
 #define PROT_ERR_VALID_AGENT_ADDRESS		BIT_ULL(1)
@@ -19,6 +18,17 @@
 #define PROT_ERR_VALID_DVSEC			BIT_ULL(5)
 #define PROT_ERR_VALID_ERROR_LOG		BIT_ULL(6)
 
+/* CXL RAS Capability Structure, CXL v3.0 sec 8.2.4.16 */
+struct cxl_ras_capability_regs {
+	u32 uncor_status;
+	u32 uncor_mask;
+	u32 uncor_severity;
+	u32 cor_status;
+	u32 cor_mask;
+	u32 cap_control;
+	u32 header_log[16];
+};
+
 static const char * const prot_err_agent_type_strs[] = {
 	"Restricted CXL Device",
 	"Restricted CXL Host Downstream Port",

include/linux/cxl_err.h

-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * Copyright (C) 2022 Advanced Micro Devices, Inc.
- *
- * Author: Smita Koralahalli <Smita.KoralahalliChannabasappa@amd.com>
- */
-
-#ifndef LINUX_CXL_ERR_H
-#define LINUX_CXL_ERR_H
-
-/* CXL RAS Capability Structure, CXL v3.1 sec 8.2.4.16 */
-struct cxl_ras_capability_regs {
-	u32 uncor_status;
-	u32 uncor_mask;
-	u32 uncor_severity;
-	u32 cor_status;
-	u32 cor_mask;
-	u32 cap_control;
-	u32 header_log[16];
-};
-
-#endif //__CXL_ERR_