ARM: dts: msm: Add llcc perfmon device for sdm670

Adding llcc perfmon configuration. Perfmon driver can monitor llcc
hardware events, which can be used for profiling.

Change-Id: I1afba2c99c876bab0380a876a943c2e2f2d98b69
Signed-off-by: Sankaran Nampoothiri <snampoot@codeaurora.org>