Bump skiboot-p10 up to b81f146

Changes since commit 4e568bf:

Ryan Grimm (3):
      Revert "DD1 workaround: paranoid chiptod patch"
      DD1 chiptod workaround version 4
      Revert "Turn on debugging in chiptod sync path"

----------------------------------------------------------------
 hw/chiptod.c | 135 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++---------------------------------------------------
 1 file changed, 73 insertions(+), 62 deletions(-)

Signed-off-by: Klaus Heinrich Kiwi <klaus@linux.vnet.ibm.com>
diff --git a/openpower/configs/rainier_defconfig b/openpower/configs/rainier_defconfig
index 7e10fe6..a40f4cc 100644
--- a/openpower/configs/rainier_defconfig
+++ b/openpower/configs/rainier_defconfig
@@ -26,7 +26,7 @@
 BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y
 BR2_PACKAGE_SKIBOOT=y
 BR2_SKIBOOT_CUSTOM_VERSION=y
-BR2_SKIBOOT_CUSTOM_VERSION_VALUE="4e568bf15692ec2b26440288aad87e02daeba4b0"
+BR2_SKIBOOT_CUSTOM_VERSION_VALUE="b81f1465872ece79fbf9867e48905a30745759ef"
 BR2_SKIBOOT_CUSTOM_GIT=y
 BR2_SKIBOOT_CUSTOM_REPO_URL="git@github.ibm.com:p10/skiboot.git"
 BR2_PACKAGE_BUSYBOX_CONFIG_FRAGMENT_FILES="$(BR2_EXTERNAL_OP_BUILD_PATH)/configs/busybox.fragment"