ARM: dts: msm: Enable ACD functionality for SDM660 silver cluster

The adaptive clock distribution (ACD) mitigates the impact of
high-frequency supply voltage (VDD) droops on microprocessor
performance.

Program ACD functional configuration for silver cluster of sdm660.

Also add the voltage margin savings with ACD to the existing
APC0 CPR closed-loop voltage margins.

Also set CPR_RAMP_EN and VCTL_RAMP_EN bits to 1 in AVS control
register of silver cluster.

Change-Id: Iaff7769cd1e71bbeb773658d0649092bff6e8916
Signed-off-by: Tirupathi Reddy <tirupath@codeaurora.org>