kernel: Move to Linux v5.4.25-openpower1

A backport from the scsi tree for an issue with the IPR
adaptor is added.

PowerPC releated changes:

 powerpc: fix hardware PMU exception bug on PowerVM compatibility mode systems
 powerpc/mm: Fix missing KUAP disable in flush_coherent_icache()
 powerpc: Convert flush_icache_range & friends to C
 powerpc: define helpers to get L1 icache sizes
 powerpc/hugetlb: Fix 8M hugepages on 8xx
 powerpc/hugetlb: Fix 512k hugepages on 8xx with 16k page size
 powerpc/entry: Fix an #if which should be an #ifdef in entry_32.S
 powerpc/tm: Fix clearing MSR[TS] in current when reclaiming on signal delivery
 powerpc/eeh: Fix deadlock handling dead PHB

Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/openpower/configs/vesnin_defconfig b/openpower/configs/vesnin_defconfig
index 65d4fab..c9d693f 100644
--- a/openpower/configs/vesnin_defconfig
+++ b/openpower/configs/vesnin_defconfig
@@ -16,7 +16,7 @@
 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="5.4.22"
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.4.25"
 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"