sparc32: remove runtime btfix support

- remove all uses of btfixup header
- remove the btfixup header
- remove the btfixup code

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc/kernel/irq_32.c

@@ -366,6 +366,5 @@ void __init init_IRQ(void)
 		prom_printf("Cannot initialize IRQs on this Sun machine...");
 		break;
 	}
-	btfixup();
 }