ARM: dts: msm: Add krait-pmu to platforms with Krait CPUs

Allows us to probe the performance counters on Krait CPUs.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
[olof: Moved 8960 contents to the dtsi instead]
Signed-off-by: Olof Johansson <olof@lixom.net>