kmod-sched-cake: bump to latest cake

331ac70 Correctly update parent qlen when splitting GSO packets
581967c Makefile: Hook into Kbuild/Kconfig infrastructure

The parent qlen change is relevant if using cake as a leaf qdisc,
the makefile is a no-op.

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

package/kernel/kmod-sched-cake/Makefile

@@ -13,9 +13,9 @@ PKG_RELEASE:=1
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL:=https://github.com/dtaht/sch_cake.git
-PKG_SOURCE_DATE:=2018-10-02
-PKG_SOURCE_VERSION:=ddf4c95145f2fbcca16f19e01f3195d213ca760b
-PKG_MIRROR_HASH:=c5fd914fa1129e1cbe46e3dff30077b3265446538831e3a668229c22c4cf497a
+PKG_SOURCE_DATE:=2019-01-08
+PKG_SOURCE_VERSION:=331ac70c8580544cd08a556579dc8807d9941d2e
+PKG_MIRROR_HASH:=e2174531a92d1e9c48bcb74757399255aa205cb64f9863f307e357c5e23c3449
 PKG_MAINTAINER:=Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
 
 include $(INCLUDE_DIR)/package.mk