kernel: bump 4.9 to 4.9.186

Refreshed all patches.

Fixes:
- CVE-2019-3846

Compile-tested on: ar71xx
Runtime-tested on: ar71xx

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

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

@@ -33,8 +33,8 @@ 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)
-@@ -649,11 +654,6 @@ KBUILD_CFLAGS	+= $(call cc-disable-warni
- KBUILD_CFLAGS	+= $(call cc-disable-warning, int-in-bool-context)
+@@ -650,11 +655,6 @@ KBUILD_CFLAGS	+= $(call cc-disable-warni
+ KBUILD_CFLAGS	+= $(call cc-disable-warning, address-of-packed-member)
  KBUILD_CFLAGS	+= $(call cc-disable-warning, attribute-alias)
  
 -ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
@@ -171,7 +171,7 @@ Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
  	.init.data : {
 --- a/arch/mips/Kconfig
 +++ b/arch/mips/Kconfig
-@@ -55,6 +55,7 @@ config MIPS
+@@ -56,6 +56,7 @@ config MIPS
  	select CLONE_BACKWARDS
  	select HAVE_DEBUG_STACKOVERFLOW
  	select HAVE_CC_STACKPROTECTOR

target/linux/generic/hack-4.9/301-mips_image_cmdline_hack.patch

@@ -10,7 +10,7 @@ Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
 
 --- a/arch/mips/Kconfig
 +++ b/arch/mips/Kconfig
-@@ -1159,6 +1159,10 @@ config SYNC_R4K
+@@ -1160,6 +1160,10 @@ config SYNC_R4K
  config MIPS_MACHINE
  	def_bool n