p10/kernel: Move to v5.10.50-openpower1

- Updated denali and rainier configs
- Manually rebased to v5.10.50 kernel
- Removed openpower/linux-p10 directory
- Updated skiroot_defconfig based on upstream master

Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
diff --git a/openpower/configs/denali_defconfig b/openpower/configs/denali_defconfig
index ed3f2dd..7009fd7 100644
--- a/openpower/configs/denali_defconfig
+++ b/openpower/configs/denali_defconfig
@@ -1,5 +1,6 @@
 BR2_powerpc64le=y
 BR2_powerpc_power8=y
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_5_10=y
 BR2_BINUTILS_EXTRA_CONFIG_OPTIONS="--enable-targets=powerpc64-linux"
 BR2_EXTRA_GCC_CONFIG_OPTIONS="--enable-targets=powerpc64-linux --disable-libsanitizer"
 BR2_TARGET_GENERIC_HOSTNAME="skiroot"
@@ -13,10 +14,9 @@
 BR2_ROOTFS_OVERLAY="../openpower/overlay"
 BR2_ROOTFS_POST_BUILD_SCRIPT="../openpower/scripts/fixup-target-var ../openpower/scripts/firmware-whitelist"
 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="e4f7620c0a1e46e93ab9130f30bfa28b32322ca1"
-BR2_LINUX_KERNEL_PATCH="$(BR2_EXTERNAL_OP_BUILD_PATH)/linux-p10"
+BR2_LINUX_KERNEL_CUSTOM_VERSION=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.10.50"
+BR2_LINUX_KERNEL_PATCH="$(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"
 BR2_LINUX_KERNEL_ZIMAGE_EPAPR=y