powerpc, 5xx: remove support for 5xx

There was for long time no activity in the 5xx area.
We need to go further and convert to Kconfig, but it
turned out, nobody is interested anymore in 5xx,
so remove it.

Signed-off-by: Heiko Schocher <hs@denx.de>

arch/powerpc/lib/time.c

@@ -64,21 +64,10 @@ int timer_init(void)
 {
 	unsigned long temp;
 
-#if defined(CONFIG_5xx)
-	volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
-
-	/* unlock */
-	immap->im_sitk.sitk_tbk = KAPWR_KEY;
-#endif
-
 	/* reset */
 	asm volatile("li %0,0 ; mttbu %0 ; mttbl %0;"
 	     : "=&r"(temp) );
 
-#if defined(CONFIG_5xx)
-	/* enable */
-	immap->im_sit.sit_tbscr |= TBSCR_TBE;
-#endif
 	return (0);
 }
 /* ------------------------------------------------------------------------- */