Remove vestiges of the syncicache() call originally in powerpc/ofwboot

before rev 1.4. This change makes OF 2.4 machines actually boot, and
it works fine on my OF 2.01 machine. No reports of failures on other
archs.

I expect this change is fine as the original code flushed the just-loaded
ofwboot out of the cache, conditionalized on FIRMWORKSBUGS. In rev.
1.4, the code got in-lined, and changed to actually flush low memory
out of the cache. Since machines kept booting, I expect the firmware
was really flushing the binary out of the cache, so we're fine.

sys/arch/macppc/stand/ofwboot/Locore.c

@@ -1,4 +1,4 @@
-/*	$NetBSD: Locore.c,v 1.10 2002/03/29 15:15:07 tsutsui Exp $	*/
+/*	$NetBSD: Locore.c,v 1.11 2002/09/27 00:32:17 wrstuden Exp $	*/
 
 /*
  * Copyright (C) 1995, 1996 Wolfgang Solfrank.
@@ -58,14 +58,6 @@ asm("
 	.text
 	.globl	_start
 _start:
-	li	8,0
-	li	9,0x100
-	mtctr	9
-1:
-	dcbf	0,8
-	icbi	0,8
-	addi	8,8,0x20
-	bdnz	1b
 	sync
 	isync