kernel: bump 4.14 to 4.14.23

This patch bumps the 4.14 kernel to .23.
- Refreshed patches.
- Deleted bcm53xx/patches-4.14/089-PCI-iproc-Fix-NULL-pointer-dereference-for-BCMA.patch. Has been accepted upstream.
- Deleted generic/pending-4.14/821-usb-Remove-annoying-warning-about-bogus-URB.patch. The upstream URB code was changed,
  the patch no longer applies. I discussed this with the patch author and removed it for now, we'll see how it goes.

Compile-tested on: ramips/mt7621, x86/64
Run-tested on: ramips/mt7621, x86/64

Signed-off-by: Stijn Segers <foss@volatilesystems.org>

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
-@@ -360,6 +360,29 @@ static inline void setup_nr_cpu_ids(void
+@@ -359,6 +359,29 @@ 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
-@@ -541,6 +564,7 @@ asmlinkage __visible void __init start_k
+@@ -540,6 +563,7 @@ asmlinkage __visible void __init start_k
  	add_device_randomness(command_line, strlen(command_line));
  	boot_init_stack_canary();
  	mm_init_cpumask(&init_mm);