Remove all v4.9 recipes and build Linux using the same branch on all platforms.
The .inc files were only needed because of the existence of multiple Linux
versions, but that's not the case anymore, so remove them.
https://jira.digi.com/browse/DEL-7221
Signed-off-by: Gabriel Valcazar <gabriel.valcazar@digi.com>
Remove support to kernel v4.14 and move platforms to use the new
kernel v5.4
https://jira.digi.com/browse/DEL-7013
Signed-off-by: Arturo Buzarra <arturo.buzarra@digi.com>