kernel: Move to Linux v5.3.5-openpower1

This adds Firmware Assissted dump passthrough mode to the OpenPower
kernel. These patches were backported from 5.4, and the
CONFIG_PRESERVE_FA_DUMP was added.

PowerPC related changes:

 powerpc: dump kernel log before carrying out fadump or kdump
 powerpc/eeh: Clean up EEH PEs after recovery finishes
 powerpc/64s/exception: machine check use correct cfar for late handler
 powerpc/eeh: Clear stale EEH_DEV_NO_HANDLER flag
 powerpc/perf: fix imc allocation failure handling
 powerpc/64s/radix: Fix memory hotplug section page table creation
 powerpc/futex: Fix warning: 'oldval' may be used uninitialized in this function
 powerpc/ptdump: fix walk_pagetables() address mismatch
 powerpc/rtas: use device model APIs and serialization during LPM
 powerpc/xmon: Check for HV mode when dumping XIVE info from OPAL
 powerpc/powernv/ioda2: Allocate TCE table levels on demand for default DMA window
 powerpc/imc: Dont create debugfs files for cpu-less nodes
 powerpc/Makefile: Always pass --synthetic to nm if supported
 powerpc/xive: Fix bogus error code returned by OPAL

Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/openpower/configs/opal_defconfig b/openpower/configs/opal_defconfig
index 9e32162..83c5362 100644
--- a/openpower/configs/opal_defconfig
+++ b/openpower/configs/opal_defconfig
@@ -12,7 +12,7 @@
 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="5.3.1"
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.3.5"
 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"