ARM: dts: msm: Tune power cluster L2 latencies for msm8937

Tune power cluster L2 GDHS and PC latencies for msm8937
as per PSCI measurements done on msm8952.

Change-Id: I9d145d905147ab98557662d5a000981c62e8f86e
Signed-off-by: Srinivas Rao L <lsrao@codeaurora.org>