oops, fix typo

SVN-Revision: 17042

target/linux/ppc40x/Makefile

@@ -10,7 +10,7 @@ ARCH:=powerpc
 BOARD:=ppc40x
 BOARDNAME:=AMCC/IBM PPC40x
 FEATURES:=squashfs usb
-CFLAGS:=-Os -pipe -funit-at-a-time -mcpu=440
+CFLAGS:=-Os -pipe -funit-at-a-time -mcpu=405
 
 LINUX_VERSION:=2.6.30.3
 LINUX_KARCH:=powerpc