Backport A64 unstable timer patches from linux 5.1
Signed-off-by: Oskari Lemmela <oskari@lemmela.net>
[Split the single patch into the two original patches]
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
To make it easier to support multiple kernel versions in parallel also
copy the sub target specific kernel configurations into kernel specific
files.
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>