EDAC/amd64: Remove unused struct member amd64_pvt::ext_nbcfg

Commit

  cfe40fd ("amd64_edac: add driver header")

added amd64_pvt struct with ext_nbcfg in it. But no one used that member
since then.

Therefore, remove it.

Found by https://github.com/jirislaby/clang-struct.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Yazen Ghannam <yazen.ghannam@amd.com>
Link: https://lore.kernel.org/r/20240213112051.27715-2-jirislaby@kernel.org
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>

Author: Jiri Slaby (SUSE)

drivers/edac/amd64_edac.h

@@ -345,7 +345,6 @@ struct amd64_pvt {
 	u32 dchr1;		/* DRAM Configuration High DCT1 reg */
 	u32 nbcap;		/* North Bridge Capabilities */
 	u32 nbcfg;		/* F10 North Bridge Configuration */
-	u32 ext_nbcfg;		/* Extended F10 North Bridge Configuration */
 	u32 dhar;		/* DRAM Hoist reg */
 	u32 dbam0;		/* DRAM Base Address Mapping reg for DCT0 */
 	u32 dbam1;		/* DRAM Base Address Mapping reg for DCT1 */