linux-headers: bump 4.{14, 16, 17}.x series

[Peter: drop 4.17.x change]
Signed-off-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit 0fee303fff5d6cb979a7b197b3e6a3cf3fb3fc0b)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/linux-headers/Config.in.host

@@ -256,7 +256,7 @@ config BR2_DEFAULT_KERNEL_HEADERS
 	default "4.11.12"	if BR2_KERNEL_HEADERS_4_11
 	default "4.12.14"	if BR2_KERNEL_HEADERS_4_12
 	default "4.13.16"	if BR2_KERNEL_HEADERS_4_13
-	default "4.14.48"	if BR2_KERNEL_HEADERS_4_14
+	default "4.14.49"	if BR2_KERNEL_HEADERS_4_14
 	default "4.15.18"	if BR2_KERNEL_HEADERS_4_15
-	default "4.16.14"	if BR2_KERNEL_HEADERS_4_16
+	default "4.16.15"	if BR2_KERNEL_HEADERS_4_16
 	default BR2_DEFAULT_KERNEL_VERSION if BR2_KERNEL_HEADERS_VERSION