ARM: dts: msm: add pmxpoorwills PMIC peripheral devices

Add a new device tree file for pmxpoorwills PMIC nodes. Add device
node for PON module.

CRs-Fixed: 2094360
Change-Id: I046f3697e957c10450a737738bc955f6754d8002
Signed-off-by: Tirupathi Reddy <tirupath@codeaurora.org>