ARM: dts: msm: Increase CPR UP threshold to 2 for 8939 QRD platform

The change increases CPR UP_THRESH to 2 for 8939 QRD platforms to
mitigate the voltage ripple up to 37.5mV on VDD_APC.

CRs-Fixed: 718064
Change-Id: Ib77a9d79a9358b5f5a1f69a7b1ac9d96a91339c9
Signed-off-by: Tirupathi Reddy <tirupath@codeaurora.org>