ARM: dts: msm: Add device entry for CNSS platform driver for MSM8992

Add CNSS platform driver device entry for MSM8992 in order to enable
WLAN functionality. Also add the corresponding pinctrl items and reserve
0-4K physical memory which is required for WLAN hardware in MSM8992.

Change-Id: I8c8dcfb6f71b34b697297d9b1acd618d90aeb882
Signed-off-by: Yue Ma <yuem@codeaurora.org>