[SRU][Bionic] Update ThunderX2 implementation defined pmu core events

[Seth Forshee]

On Tue, Oct 09, 2018 at 09:52:44AM -0500, Manoj Iyer wrote:
> Please consider the following patch to ARM64 ThunderX2 PMU core events. The ARM architecture defines several events as part of the Performance Monitor Unit (PMU) Extension. In addition, Cavium has added "implementation defined" pmu core events, which Cavium deems most useful for analyzing performance. Currently perf does not list these "implementation defined" events.
> 
> The patch was tested by me on a Cavium ThunderX2 system and no
> regressions were found.

I don't see this patch in cosmic, is it needed there too?