kernel: generic: Add kernel 4.14 support

This adds initial support for kernel 4.14 based on the patches for
kernel 4.9.

In the configuration I deactivated some of the new possible security
features like:
CONFIG_REFCOUNT_FULL
CONFIG_SLAB_FREELIST_HARDENED
CONFIG_SOFTLOCKUP_DETECTOR
CONFIG_WARN_ALL_UNSEEDED_RANDOM

And these overlay FS options are also deactivated:
CONFIG_OVERLAY_FS_INDEX
CONFIG_OVERLAY_FS_REDIRECT_DIR

I activated this:
CONFIG_FORTIFY_SOURCE
CONFIG_POSIX_TIMERS
CONFIG_SLAB_MERGE_DEFAULT
CONFIG_WATCHDOG_HANDLE_BOOT_ENABLED

I am not sure if I did the porting correct for the following patches:
target/linux/generic/backport-4.14/020-backport_netfilter_rtcache.patch
target/linux/generic/hack-4.14/220-gc_sections.patch
target/linux/generic/hack-4.14/321-powerpc_crtsavres_prereq.patch
target/linux/generic/pending-4.14/305-mips_module_reloc.patch
target/linux/generic/pending-4.14/611-netfilter_match_bypass_default_table.patch
target/linux/generic/pending-4.14/680-NET-skip-GRO-for-foreign-MAC-addresses.patch

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

target/linux/generic/hack-4.14/212-byteshift_portability.patch

@@ -0,0 +1,65 @@
+From 48232d3d931c95953ce2ddfe7da7bb164aef6a73 Mon Sep 17 00:00:00 2001
+From: Felix Fietkau <nbd@nbd.name>
+Date: Fri, 7 Jul 2017 17:03:16 +0200
+Subject: linux-3.6: fix portability of some includes files in tools/ used on the host
+
+lede-commit: 6040b1d29ab1f047c5e49b748abcb6a3196add28
+Signed-off-by: Felix Fietkau <nbd@nbd.name>
+---
+ tools/include/tools/be_byteshift.h |  4 ++++
+ tools/include/tools/le_byteshift.h |  4 ++++
+ tools/include/tools/linux_types.h  | 22 ++++++++++++++++++++++
+ 3 files changed, 30 insertions(+)
+ create mode 100644 tools/include/tools/linux_types.h
+
+--- a/tools/include/tools/be_byteshift.h
++++ b/tools/include/tools/be_byteshift.h
+@@ -2,6 +2,10 @@
+ #ifndef _TOOLS_BE_BYTESHIFT_H
+ #define _TOOLS_BE_BYTESHIFT_H
+ 
++#ifndef __linux__
++#include "linux_types.h"
++#endif
++
+ #include <stdint.h>
+ 
+ static inline uint16_t __get_unaligned_be16(const uint8_t *p)
+--- a/tools/include/tools/le_byteshift.h
++++ b/tools/include/tools/le_byteshift.h
+@@ -2,6 +2,10 @@
+ #ifndef _TOOLS_LE_BYTESHIFT_H
+ #define _TOOLS_LE_BYTESHIFT_H
+ 
++#ifndef __linux__
++#include "linux_types.h"
++#endif
++
+ #include <stdint.h>
+ 
+ static inline uint16_t __get_unaligned_le16(const uint8_t *p)
+--- /dev/null
++++ b/tools/include/tools/linux_types.h
+@@ -0,0 +1,22 @@
++#ifndef __LINUX_TYPES_H
++#define __LINUX_TYPES_H
++
++#include <stdint.h>
++
++typedef uint8_t __u8;
++typedef uint8_t __be8;
++typedef uint8_t __le8;
++
++typedef uint16_t __u16;
++typedef uint16_t __be16;
++typedef uint16_t __le16;
++
++typedef uint32_t __u32;
++typedef uint32_t __be32;
++typedef uint32_t __le32;
++
++typedef uint64_t __u64;
++typedef uint64_t __be64;
++typedef uint64_t __le64;
++
++#endif