kernel: bump 4.14 to 4.14.158

Refreshed all patches.

Altered patches:
- 400-mtd-add-rootfs-split-support.patch

Compile-tested on: cns3xxx
Runtime-tested on: cns3xxx

Signed-off-by: Koen Vandeputte <koen.vandeputte@ncentric.com>

target/linux/generic/pending-4.14/920-mangle_bootargs.patch

@@ -31,7 +31,7 @@ Signed-off-by: Imre Kaloz <kaloz@openwrt.org>
  	help
 --- a/init/main.c
 +++ b/init/main.c
-@@ -359,6 +359,29 @@ static inline void setup_nr_cpu_ids(void
+@@ -358,6 +358,29 @@ static inline void setup_nr_cpu_ids(void
  static inline void smp_prepare_cpus(unsigned int maxcpus) { }
  #endif
  
@@ -61,7 +61,7 @@ Signed-off-by: Imre Kaloz <kaloz@openwrt.org>
  /*
   * We need to store the untouched command line for future reference.
   * We also need to store the touched command line since the parameter
-@@ -540,6 +563,7 @@ asmlinkage __visible void __init start_k
+@@ -539,6 +562,7 @@ asmlinkage __visible void __init start_k
  	add_device_randomness(command_line, strlen(command_line));
  	boot_init_stack_canary();
  	mm_init_cpumask(&init_mm);