kmod-sched-cake: bump to 20200110

kmod-sched-cake: bump to 20200110

Keep up with a small amount of churn in the upstream repository.
Upstream now represents the version of CAKE as found in the linux kernel
from 4.19 onwards but with some compatibility stubs to allow building on
<4.19.

After a diversion related to an experimental ECN implementation which
has now been reverted, the important and relevant changes for us are:

8a8946b sch_cake: avoid possible divide by zero in cake_enqueue()
183b320 RFC 8622 diffserv3, 4 & 8 LE PHB support
6ff4561 sch_cake: Make sure we can write the IP header before changing DSCP bits
9fba602 sch_cake: Use tc_skb_protocol for getting packet protocol

Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>