kernel: Move to Linux v5.2.5-openpower1

PowerPC related fixes:

 powerpc/pmu: Set pmcregs_in_use in paca when running as LPAR
 powerpc/tm: Fix oops on sigreturn on systems without TM
 powerpc/mm: Limit rma_size to 1TB when running without HV mode
 powerpc/xive: Fix loop exit-condition in xive_find_target_in_mask()
 powerpc/dma: Fix invalid DMA mmap behavior
 powerpc/eeh: Handle hugepages in ioremap space
 powerpc/boot: add {get, put}_unaligned_be32 to xz_config.h
 powerpc/irq: Don't WARN continuously in arch_local_irq_restore()
 powerpc/mm: Handle page table allocation failures
 powerpc/mm: mark more tlb functions as __always_inline
 powerpc: silence a -Wcast-function-type warning in dawr_write_file_bool
 powerpc/xmon: Fix disabling tracing while in xmon
 powerpc/cacheflush: fix variable set but not used
 powerpc/pci/of: Fix OF flags parsing for 64bit BARs
 powerpc/powernv: Fix stale iommu table base after VFIO
 powerpc/powernv/idle: Fix restore of SPRN_LDBAR for POWER9 stop state.
 powerpc/powernv/npu: Fix reference leak
 powerpc/watchpoint: Restore NV GPRs while returning from exception
 mm/nvdimm: add is_ioremap_addr and use that to check ioremap address

Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/openpower/configs/garrison_defconfig b/openpower/configs/garrison_defconfig
index 185ff06..d0a1f00 100644
--- a/openpower/configs/garrison_defconfig
+++ b/openpower/configs/garrison_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="5.2.1"
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.2.5"
 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"