ARM: dts: msm: Set core clock config to zero

This will ensure that System and AXI clocks are always provided
to the MVP_CORE. This register must be set at Cold & Warm boot,
before PIL load.

CRs-Fixed: 2384822
Change-Id: I71a0b3b191134e9bf6abbcac0472f004fc3638eb
Signed-off-by: Chinmay Sawarkar <chinmays@codeaurora.org>