Use in tree version of cake for kernels 4.19+ and backport features from
later kernel versions to 4.19.
Unfortunately PROVIDES dependency handling produces bogus circular
dependency warnings so whilst this package and kmod-sched-cake-oot
should be able to PROVIDE kmod-sched-cake this doesn't work.
Instead, remove the PROVIDES option and modify package sqm-scripts to
depend on the correct module independently.
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>