kernel: bump 4.19 to 4.19.84

Refreshed all patches.

Altered patches:
- 950-0748-net-bcmgenet-Workaround-for-Pi-4B-network-issue.patch
- 950-0754-Revert-net-bcmgenet-Workaround-for-Pi-4B-network-iss.patch
- 902-debloat_proc.patch

Remove upstreamed:
- 150-MIPS-bmips-mark-exception-vectors-as-char-arrays.patch

New symbols:
X86_INTEL_MPX
X86_INTEL_MEMORY_PROTECTION_KEYS
X86_INTEL_TSX_MODE_OFF
X86_INTEL_TSX_MODE_ON
X86_INTEL_TSX_MODE_AUTO

Compile-tested on: cns3xxx, x86_64
Runtime-tested on: cns3xxx

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

target/linux/generic/hack-4.19/207-disable-modorder.patch

@@ -15,7 +15,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
 
 --- a/Makefile
 +++ b/Makefile
-@@ -1226,7 +1226,6 @@ all: modules
+@@ -1232,7 +1232,6 @@ all: modules
  
  PHONY += modules
  modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
@@ -23,7 +23,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  	@$(kecho) '  Building modules, stage 2.';
  	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
  
-@@ -1255,7 +1254,6 @@ _modinst_:
+@@ -1261,7 +1260,6 @@ _modinst_:
  		rm -f $(MODLIB)/build ; \
  		ln -s $(CURDIR) $(MODLIB)/build ; \
  	fi