Unfortunately I don't think there is a newer version of the kernel than that, at least not that anyone has released (it is possible xobs/Sean Cross might have code for a newer build laying around somewhere, but if so I'm not aware); not long after that version was baked the layout of the ARM platform in the linux kernel diverged a lot and the older kernel version was from a time where hardly any of the SoC vendors (including Marvell) were getting anything into the mainline.
It would theoretically be possible to get a 3.x kernel up by forward-porting the divergent patches between that OE kernel and the linux kernel version from that time, but I'm not aware of any current working code for that. Due to the changes in the kernel, it wouldn't be trivial to do.