ARM: dts: msm: Add wcnss entry for 8939

Add wcnss device tree entry which contains following
required configurations for WCNSS on 8939:
-Memory map config.
-Pin control config.
-Gpio config.
-Clocks config.

Change-Id: I39eb9f307172b4c68b58417b84ce6913799b6ec1
CRs-Fixed: 659225
Signed-off-by: Pradeep Kumar Goudagunta <gpradeep@codeaurora.org>