powerpc: remove 4xx support

There was for long time no activity in the 4xx area.
We need to go further and convert to Kconfig, but it
turned out, nobody is interested anymore in 4xx,
so remove it.

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

post/lib_powerpc/cpu.c

@@ -66,10 +66,6 @@ int cpu_post_test (int flags)
 	WATCHDOG_RESET();
 	if (ic)
 		icache_disable ();
-#ifdef CONFIG_4xx_DCACHE
-	/* disable cache */
-	change_tlb(gd->bd->bi_memstart, gd->bd->bi_memsize, TLB_WORD2_I_ENABLE);
-#endif
 
 	if (ret == 0)
 		ret = cpu_post_test_cmp ();
@@ -118,10 +114,6 @@ int cpu_post_test (int flags)
 
 	if (ic)
 		icache_enable ();
-#ifdef CONFIG_4xx_DCACHE
-	/* enable cache */
-	change_tlb(gd->bd->bi_memstart, gd->bd->bi_memsize, 0);
-#endif
 
 	WATCHDOG_RESET();