Upgrade kernel to 4.14.341-openela

This is a continuation of the 4.14 series by the Open Enterprise Linux
Alliance, ostensibly to the same maintenance standards as the now
discontinued kernel.org LTS.

This code is primarily offered as a Git repository, with gz tarballs
also available, but no xz versions. Switching back to a gzipped version
of the kernel source code would introduce too much srcfs growth, so we
use the last kernel.org tar.xz release (4.14.336), and apply OpenELA's
changes using a patch generated from the Git repository.

steps/linux-4.14.336/patches/initramfs_list.patch

@@ -1,17 +0,0 @@
-SPDX-FileCopyrightText: 2021 fosslinux <fosslinux@aussies.space>
-
-SPDX-License-Identifier: GPL-2.0-only
-
-Use gen_initramfs_list.sh from outside kernel source tree.
-
---- scripts/gen_initramfs_list.sh	2021-10-10 20:37:12.220231015 +1100
-+++ scripts/gen_initramfs_list.sh	2021-10-10 20:37:22.694296140 +1100
-@@ -310,7 +310,7 @@
- 			fi
- 		fi
- 		cpio_tfile="$(mktemp ${TMPDIR:-/tmp}/cpiofile.XXXXXX)"
--		usr/gen_init_cpio $timestamp ${cpio_list} > ${cpio_tfile}
-+		gen_init_cpio $timestamp ${cpio_list} > ${cpio_tfile}
- 	else
- 		cpio_tfile=${cpio_file}
- 	fi