CHANGES: fix Aarch64 typo

Thanks to WIll Newton to noticing.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

CHANGES

@@ -2,7 +2,7 @@
 
 	Toolchain: Crosstool-ng 1.17.0, default to GCC 4.6.3, target
 	libraries install fixed. Add Linaro ARM
-	2012.11/2012.12/2013.01, Aarch4 12.11/12.12/13.01. Sourcery
+	2012.11/2012.12/2013.01, Aarch64 12.11/12.12/13.01. Sourcery
 	CodeBench MIPS 2012.03/09. Infrastructure to warn about
 	missing 32bit support for binary toolchains. Add GDB 7.5.1 /
 	Remove 6.8 / 7.0 / 7.1.