Remove LYNX KDI remainders

The last board that used to set CONFIG_LYNXKDI has been removed in
commit 242836a893 ("powerpc: ppc4xx: remove pcs440ep support"),
doc/README.lynxkdi only talks about a MPC8260 board being supported,
and the mpc8260 support has been removed four years ago in commit
2eb48ff7a2 ("powerpc, 8260: remove support for mpc8260") already,
and common/lynxkdi.c only consists of an "#error" statement these
days, so it seems like the LYNX KDI code is dead code nowadays.
Let's remove it now.

Signed-off-by: Thomas Huth <thuth@redhat.com>

include/bootm.h

@@ -39,7 +39,6 @@ extern boot_os_fn do_bootm_linux;
 extern boot_os_fn do_bootm_vxworks;
 
 int do_bootelf(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[]);
-void lynxkdi_boot(image_header_t *hdr);
 
 boot_os_fn *bootm_os_get_boot_func(int os);
 

include/lynxkdi.h

@@ -1,24 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0+ */
-/*
- * (C) Copyright 2003
- * Orbacom Systems, Inc.
- */
-
-#ifndef __LYNXKDI_H__
-#define __LYNXKDI_H__
-
-
-/* Boot parameter struct passed to kernel
- */
-typedef struct lynxos_bootparms_t {
-	uint8_t		rsvd1[2];	/* Reserved			*/
-	uint8_t		ethaddr[6];	/* Ethernet address		*/
-	uint16_t	flags;		/* Boot flags			*/
-	uint32_t	rate;		/* System frequency		*/
-	uint32_t	clock_ref;	/* Time reference		*/
-	uint32_t	dramsz;		/* DRAM size			*/
-	uint32_t	rsvd2;		/* Reserved			*/
-} lynxos_bootparms_t;
-
-
-#endif	/* __LYNXKDI_H__ */