[MIPS] Au1xx0: really set KSEG0 to uncached on reboot

    
Fix a really old buglet in AMD Au1xx0 restart code: instead of
modifying the whole CP0 Config.K0 field to 010b (meaning KSEG0 uncached)
before flushing the caches and resetting a board, it only sets bit 1 of that
reg. which is effectively a NOP since Config.K0 == 011b as the kernel sets it
up (which is also its default value for Au1xx0).
    
Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/au1000/common/reset.c

@@ -151,7 +151,7 @@ void au1000_restart(char *command)
 	}
 
 	set_c0_status(ST0_BEV | ST0_ERL);
-	set_c0_config(CONF_CM_UNCACHED);
+	change_c0_config(CONF_CM_CMASK, CONF_CM_UNCACHED);
 	flush_cache_all();
 	write_c0_wired(0);