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/regen.patch

@@ -1,18 +0,0 @@
-SPDX-FileCopyrightText: 2021 fosslinux <fosslinux@aussies.space>
-
-SPDX-License-Identifier: GPL-2.0-only
-
-We do not use the _shipped version of the keymap generated using loadkeys.
-For some reason the makefile needs to be patched for this to work...
-
---- drivers/tty/vt/Makefile	2021-07-27 21:11:24.743104498 +1000
-+++ drivers/tty/vt/Makefile	2021-07-27 21:11:34.261186200 +1000
-@@ -22,7 +22,7 @@
- # Uncomment if you're changing the keymap and have an appropriate
- # loadkeys version for the map. By default, we'll use the shipped
- # versions.
--# GENERATE_KEYMAP := 1
-+GENERATE_KEYMAP := 1
- 
- ifdef GENERATE_KEYMAP
-