kernel: Move to Linux v4.19.4-openpower1

PowerPC fixes (4.19.2, 4.19.3, 4.19.4):

  powerpc/memtrace: Remove memory in chunks
  powerpc/boot: Ensure _zimage_start is a weak symbol
  powerpc/mm: Don't report hugepage tables as memory leaks when using kmemleak
  powerpc/nohash: fix undefined behaviour when testing page size support
  powerpc/eeh: Fix possible null deref in eeh_dump_dev_log()
  powerpc/Makefile: Fix PPC_BOOK3S_64 ASFLAGS
  powerpc/mm: fix always true/false warning in slice.c
  powerpc/mm: Fix page table dump to work on Radix
  powerpc/64/module: REL32 relocation range check
  powerpc/traps: restore recoverability of machine_check interrupts
  powerpc/64s/hash: Do not use PPC_INVALIDATE_ERAT on CPUs before POWER9
  powerpc/tm: Fix HFSCR bit for no suspend case

Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/openpower/configs/garrison_defconfig b/openpower/configs/garrison_defconfig
index 5499829..aad8b59 100644
--- a/openpower/configs/garrison_defconfig
+++ b/openpower/configs/garrison_defconfig
@@ -15,7 +15,7 @@
 BR2_ROOTFS_POST_BUILD_SCRIPT="../openpower/scripts/fixup-target-var ../openpower/scripts/firmware-whitelist"
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_VERSION=y
-BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="4.19.1"
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="4.19.4"
 BR2_LINUX_KERNEL_PATCH="$(BR2_EXTERNAL_OP_BUILD_PATH)/linux"
 BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
 BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="$(BR2_EXTERNAL_OP_BUILD_PATH)/configs/linux/skiroot_defconfig"