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/ramips/patches-4.14/105-mt7621-memory-detect.patch

@@ -114,7 +114,7 @@ Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
  
 --- a/arch/mips/ralink/of.c
 +++ b/arch/mips/ralink/of.c
-@@ -106,6 +106,8 @@ void __init plat_mem_setup(void)
+@@ -89,6 +89,8 @@ void __init plat_mem_setup(void)
  	of_scan_flat_dt(early_init_dt_find_memory, NULL);
  	if (memory_dtb)
  		of_scan_flat_dt(early_init_dt_scan_memory, NULL);