ARM: dts: msm: Add power manager entry for wcnss

Add power manager entry for wcnss which is use
to send LDO change notification to FW.

CRs-Fixed: 660361

Change-Id: Idf415e89994ec6a3ae7a269e921c45caeff06fa5
Signed-off-by: Hardik Kantilal Patel <hkpatel@codeaurora.org>