linux: update to v4.2.5-openpower1

 - Rebased on upstream stable release v4.2.5

Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/openpower/configs/firestone_defconfig b/openpower/configs/firestone_defconfig
index 2a1fa06..bdf2c77 100644
--- a/openpower/configs/firestone_defconfig
+++ b/openpower/configs/firestone_defconfig
@@ -43,7 +43,7 @@
 BR2_ROOTFS_DEVICE_TABLE="../openpower/device_table.txt"
 BR2_ROOTFS_POST_BUILD_SCRIPT="../openpower/scripts/fixup-target-var"
 BR2_LINUX_KERNEL=y
-BR2_LINUX_KERNEL_VERSION="4.2.4"
+BR2_LINUX_KERNEL_VERSION="4.2.5"
 BR2_KERNEL_HEADERS_4_2=y
 BR2_LINUX_KERNEL_PATCH="$(BR2_EXTERNAL)/linux"
 BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y