[MIPS] Remove dead DECstation boot code

Code in arch/mips/dec/boot/ has been dead for long.  Let's get rid of it
before some epidemic spreads.
Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/dec/boot/Makefile

-#
-# Makefile for the DECstation family specific parts of the kernel
-#
-
-netboot: all
-	$(LD) -N -G 0 -T ld.ecoff ../../boot/zImage \
-		dec_boot.o ramdisk.img -o nbImage
-
-obj-y	 := decstation.o
-
-clean:
-	rm -f nbImage

arch/mips/dec/boot/decstation.c

-/*
- * arch/mips/dec/decstation.c
- */
-#include <asm/sections.h>
-
-#define RELOC
-#define INITRD
-#define DEBUG_BOOT
-
-/*
- * Magic number indicating REX PROM available on DECSTATION.
- */
-#define	REX_PROM_MAGIC		0x30464354
-
-#define REX_PROM_CLEARCACHE	0x7c/4
-#define REX_PROM_PRINTF		0x30/4
-
-#define VEC_RESET		0xBFC00000		/* Prom base address */
-#define	PMAX_PROM_ENTRY(x)	(VEC_RESET+((x)*8))	/* Prom jump table */
-#define	PMAX_PROM_PRINTF	PMAX_PROM_ENTRY(17)
-
-#define PARAM	(k_start + 0x2000)
-
-#define LOADER_TYPE (*(unsigned char *) (PARAM+0x210))
-#define INITRD_START (*(unsigned long *) (PARAM+0x218))
-#define INITRD_SIZE (*(unsigned long *) (PARAM+0x21c))
-
-extern int _ftext;			/* begin and end of kernel image */
-extern void kernel_entry(int, char **, unsigned long, int *);
-
-void * memcpy(void * dest, const void *src, unsigned int count)
-{
-	unsigned long *tmp = (unsigned long *) dest, *s = (unsigned long *) src;
-
-	count >>= 2;
-	while (count--)
-		*tmp++ = *s++;
-
-	return dest;
-}
-
-void dec_entry(int argc, char **argv,
-	       unsigned long magic, int *prom_vec)
-{
-	void (*rex_clear_cache)(void);
-	int (*prom_printf)(char *, ...);
-	unsigned long k_start, len;
-
-	/*
-	 * The DS5100 leaves cpu with BEV enabled, clear it.
-	 */
-	asm(	"lui\t$8,0x3000\n\t"
-		"mtc0\t$8,$12\n\t"
-		".section\t.sdata\n\t"
-		".section\t.sbss\n\t"
-		".section\t.text"
-		: : : "$8");
-
-#ifdef DEBUG_BOOT
-	if (magic == REX_PROM_MAGIC) {
-	prom_printf = (int (*)(char *, ...)) *(prom_vec + REX_PROM_PRINTF);
-	} else {
-		prom_printf = (int (*)(char *, ...)) PMAX_PROM_PRINTF;
-	}
-	prom_printf("Launching kernel...\n");
-#endif
-
-	k_start = (unsigned long) (&kernel_entry) & 0xffff0000;
-
-#ifdef RELOC
-	/*
-	 * Now copy kernel image to its destination.
-	 */
-	len = ((unsigned long) (&_end) - k_start);
-	memcpy((void *)k_start, &_ftext, len);
-#endif
-
-	if (magic == REX_PROM_MAGIC) {
-		rex_clear_cache = (void (*)(void)) * (prom_vec + REX_PROM_CLEARCACHE);
-		rex_clear_cache();
-	}
-
-	kernel_entry(argc, argv, magic, prom_vec);
-}

arch/mips/dec/boot/ld.ecoff

-OUTPUT_FORMAT("ecoff-littlemips")
-OUTPUT_ARCH(mips)
-ENTRY(dec_entry)
-SECTIONS
-{
-  . = 0x80200000;
-
-  .text :
-  {
-    _ftext = .;
-    *(.text)
-    *(.fixup)
-  }
-  .rdata :
-  {
-    *(.rodata .rodata.* .rdata)
-  }
-  .data :
-  {
-    . = ALIGN(0x1000);
-    ramdisk.img (.data)
-    *(.data)
-  }
-  .sdata :
-  {
-    *(.sdata)
-  }
-  _gp = .;
-  .sbss :
-  {
-    *(.sbss)
-    *(.scommon)
-  }
-  .bss :
-  {
-   *(.dynbss)
-   *(.bss)
-   *(COMMON)
-  }
-  /DISCARD/ : {
-    *(.reginfo .mdebug .note)
-  }
-}