Update AVR external gcc tarball to 2.2

target/device/Toolchain.in

@@ -33,7 +33,7 @@ config BR2_VENDOR_BINUTILS_RELEASE
 
 config BR2_VENDOR_GCC_RELEASE
 	string
-	default "-2.0" if BR2_TOOLCHAIN_ATMEL_AVR32
+	default "-2.2" if BR2_TOOLCHAIN_ATMEL_AVR32
 
 config BR2_VENDOR_UCLIBC_RELEASE
 	string