linux: Bump p10 kernel to v5.9-rc8-278-ge4f7620c0a1e

This rebases the p10 kernel to 5.9 series, and there are too many
changes to summarize here.

Signed-off-by: Klaus Heinrich Kiwi <klaus@linux.vnet.ibm.com>
diff --git a/openpower/configs/denali_defconfig b/openpower/configs/denali_defconfig
index 6afce38..4696b77 100644
--- a/openpower/configs/denali_defconfig
+++ b/openpower/configs/denali_defconfig
@@ -15,7 +15,7 @@
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_GIT=y
 BR2_LINUX_KERNEL_CUSTOM_REPO_URL="git@github.ibm.com:p10/linux.git"
-BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION="f607d43b7d6e54f2610933ea2da9f9732237cb51"
+BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION="e4f7620c0a1e46e93ab9130f30bfa28b32322ca1"
 BR2_LINUX_KERNEL_PATCH="$(BR2_EXTERNAL_OP_BUILD_PATH)/linux-p10"
 BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
 BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="$(BR2_EXTERNAL_OP_BUILD_PATH)/configs/linux/skiroot_defconfig"
diff --git a/openpower/configs/rainier_defconfig b/openpower/configs/rainier_defconfig
index ff01393..c9a1b3d 100644
--- a/openpower/configs/rainier_defconfig
+++ b/openpower/configs/rainier_defconfig
@@ -17,7 +17,7 @@
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_GIT=y
 BR2_LINUX_KERNEL_CUSTOM_REPO_URL="git@github.ibm.com:p10/linux.git"
-BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION="98642ab42d85ff4f0ee72300856020ea0bca2e90"
+BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION="e4f7620c0a1e46e93ab9130f30bfa28b32322ca1"
 BR2_LINUX_KERNEL_PATCH="$(BR2_EXTERNAL_OP_BUILD_PATH)/linux-p10"
 BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
 BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="$(BR2_EXTERNAL_OP_BUILD_PATH)/configs/linux/skiroot_defconfig"