linux-headers: Bump to 4.6.4 kernel

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/linux-headers/Config.in.host

@@ -240,5 +240,5 @@ config BR2_DEFAULT_KERNEL_HEADERS
 	default "4.3.6"		if BR2_KERNEL_HEADERS_4_3
 	default "4.4.14"	if BR2_KERNEL_HEADERS_4_4
 	default "4.5.7"		if BR2_KERNEL_HEADERS_4_5
-	default "4.6.3"		if BR2_KERNEL_HEADERS_4_6
+	default "4.6.4"		if BR2_KERNEL_HEADERS_4_6
 	default BR2_DEFAULT_KERNEL_VERSION if BR2_KERNEL_HEADERS_VERSION