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/ramips/patches-4.14/0013-owrt-hack-fix-mt7688-cache-issue.patch

@@ -10,7 +10,7 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
 
 --- a/arch/mips/kernel/setup.c
 +++ b/arch/mips/kernel/setup.c
-@@ -902,7 +902,6 @@ static void __init arch_mem_init(char **
+@@ -910,7 +910,6 @@ static void __init arch_mem_init(char **
  				crashk_res.end - crashk_res.start + 1,
  				BOOTMEM_DEFAULT);
  #endif
@@ -18,7 +18,7 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
  	sparse_init();
  	plat_swiotlb_setup();
  
-@@ -1018,6 +1017,7 @@ void __init setup_arch(char **cmdline_p)
+@@ -1026,6 +1025,7 @@ void __init setup_arch(char **cmdline_p)
  
  	cpu_cache_init();
  	paging_init();