binutils: default to 2.22

2.21.1 is getting quite old, the linker issues with 2.22 seems to be
(mostly?) sorted out by now and armhf needs 2.22+, so let's bump the
default version.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/binutils/Config.in.host

@@ -4,7 +4,7 @@ choice
 	prompt "Binutils Version"
 	depends on !BR2_arc
 	default BR2_BINUTILS_VERSION_2_21 if (BR2_mips || BR2_mipsel || BR2_sh)
-	default BR2_BINUTILS_VERSION_2_21_1
+	default BR2_BINUTILS_VERSION_2_22
 	help
 	  Select the version of binutils you wish to use.