ARM: dts: msm: add initial device tree for kona low power modes

Add initial device tree to support CPU and cluster low power modes on
Kona.

Also, enable apps RSC controller for flushing RPMH sleep and wake sets.

Change-Id: Ic4936e7a6adcab03dd38a5a7a0bc6ac0e89eea4b
Signed-off-by: Arjun Bagla <arbagla@codeaurora.org>
Signed-off-by: Lina Iyer <ilina@codeaurora.org>