kernel: bump 4.9 to 4.9.143

Refreshed all patches.

Altered patches:
- 950-0063-Improve-__copy_to_user-and-__copy_from_user-performa.patch
- 201-extra_optimization.patch

New symbol:
- CONFIG_HARDEN_BRANCH_PREDICTOR

Compile-tested on: ar7, at91, brcm2708, ixp4xx, layerscape, orion
Runtime-tested on: none

Signed-off-by: Koen Vandeputte <koen.vandeputte@ncentric.com>
[fix brcm2708/950-0149-Update-vfpmodule.c.patch]
Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>

target/linux/generic/hack-4.9/220-gc_sections.patch

@@ -33,7 +33,7 @@ Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
  # Read KERNELRELEASE from include/config/kernel.release (if it exists)
  KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
  KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
-@@ -638,11 +643,6 @@ KBUILD_CFLAGS	+= $(call cc-disable-warni
+@@ -671,11 +676,6 @@ KBUILD_CFLAGS	+= $(call cc-disable-warni
  KBUILD_CFLAGS	+= $(call cc-disable-warning, int-in-bool-context)
  KBUILD_CFLAGS	+= $(call cc-disable-warning, attribute-alias)
  
@@ -43,8 +43,8 @@ Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
 -endif
 -
  ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
- KBUILD_CFLAGS	+= -Os $(call cc-disable-warning,maybe-uninitialized,) $(EXTRA_OPTIMIZATION)
- else
+ KBUILD_CFLAGS	+= $(call cc-option,-Oz,-Os)
+ KBUILD_CFLAGS	+= $(call cc-disable-warning,maybe-uninitialized,) $(EXTRA_OPTIMIZATION)
 --- a/arch/arm/Kconfig
 +++ b/arch/arm/Kconfig
 @@ -81,6 +81,7 @@ config ARM